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  • richardmitnick 9:37 am on October 12, 2021 Permalink | Reply
    Tags: "Is dark matter cold or warm or hot?", , , , , Dark Matter, , , , ,   

    From Symmetry: “Is dark matter cold or warm or hot?” 

    Symmetry Mag

    From Symmetry

    10/12/21
    Glennda Chui

    The answer has to do with dark matter’s role in shaping the cosmos.

    Milky Way Dark Matter Halo Credit:L. Calçada/ European Southern Observatory [Observatoire européen austral][Europäische Südsternwarte](EU)(CL)

    Half a century after Vera Rubin and Kent Ford confirmed that a form of invisible matter—now called dark matter—is required to account for the rotation of galaxies, the evidence for its existence is overwhelming.
    _____________________________________________________________________________________
    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM, denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.

    Coma cluster via NASA/ESA Hubble.

    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.

    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.

    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).

    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).

    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970

    Dark Matter Research

    Inside the Axion Dark Matter eXperiment U Washington (US) Credit : Mark Stone U. of Washington. Axion Dark Matter Experiment.
    _____________________________________________________________________________________

    Although it is known to interact with ordinary matter only through gravity, there is such a massive amount of dark matter out there—85% of all the matter in the universe—that it has played a pivotal behind-the-scenes role in shaping all the stuff we can see, from our own Milky Way galaxy to the wispy filaments of gas that link galaxies across vast distances.

    “We think it exists because there’s evidence for it on many, many scales,” says Kevork Abazajian, a theoretical physicist and astrophysicist at The University of California-Irvine (US).

    There have been a lot of ideas about what form dark matter might take, from planet-sized objects called MACHOs to individual particles like WIMPs—weakly interacting massive particles roughly the size of a proton—and even tinier things like axions and sterile neutrinos.

    In the 1980s, scientists came up with a way to make sense of this growing collection: They started classifying proposed dark-matter particles as cold, warm or hot. These categories are based on how fast each type of dark matter would have traveled through the early universe—a speed that depended on its mass—and on how hot its surroundings were when it popped into existence.

    Light, fast particles are known as hot dark matter; heavy, slow ones are cold dark matter; and warm dark matter falls in between.

    In this way of seeing things, WIMPs are cold, sterile neutrinos are warm, and relic neutrinos from the early universe are hot. (Axions are a special case—both light and extremely cold. We’ll get to them later.)

    Why is their speed so important?

    “If a dark matter particle is lighter and faster, it can travel farther in a given time, and it will smooth out any structure that already exists along the way,” Abazajian says.

    On the other hand, slower, colder forms of dark matter would have helped build structure, and based on what we know and see today it must have been part of the mix.

    Building galaxies

    Although there are theories about when and how each type of dark-matter candidate would have formed, the only thing scientists know for sure is that dark matter was already around about 75,000 years after the Big Bang. It was then that matter started to dominate over radiation and little seeds of structure started to form, says Stanford University (US) theoretical physicist Peter Graham.

    Most types of dark-matter particles would have been created by collisions between other particles in the hot, dense soup of the infant universe, in much the same way that high-energy particle collisions at places like the Large Hadron Collider give rise to exotic new types of particles. As the universe expanded and cooled, dark-matter particles would have wound up being hot, warm or cold—and, in fact, there could have been more than one type.

    Scientists describe them as freely “streaming” through the universe, although this term is a little misleading, Abazajian says. Unlike leaves floating on a river, all headed in the same direction in a coordinated way, “these things are not just in one place and then in another place,” he says. “They’re everywhere and going in every direction.”

    As it streamed, each type of dark matter would have had a distinctive impact on the growth of structure along the way—either adding to its clumpiness, and thus to the building of galaxies, or thwarting their growth.

    Cold dark matter, such as the WIMP, would have been a clump-builder. It moved slowly enough to glom together and form gravitational wells, which would have captured nearby bits of matter.

    Hot dark matter, on the other hand, would have been a clump-smoother, zipping by so fast that it could ignore those gravitational wells. If all dark matter were hot, none of those seeds could have grown into bigger structures, says Silvia Pascoli, a theoretical physicist at The University of Bologna [Alma mater studiorum – Università di Bologna](IT). That’s why scientists now believe that hot dark-matter particles, such as relic neutrinos from the early days of the cosmos, could not constitute more than a sliver of dark matter as a whole.

    Despite their tiny contribution, Pascoli adds, “I say these relic neutrinos are currently the only known component of dark matter. They have an important impact on the evolution of the universe.”

    You might think that warm dark matter would be the best dark matter, filling the universe with a Goldilocks bowl of just-right structure. Sterile neutrinos are considered the top candidate in this category, and in theory they could indeed constitute the vast majority of dark matter.

    But most of the parameter space—the sets of conditions—where they could exist have been ruled out, says Abazajian, who as a graduate student researched how specific types of neutrino oscillations in the early universe could have produced sterile neutrino dark matter.

    Although those same oscillations could be happening today, he says, the probability that a regular neutrino would turn into a sterile one through standard oscillations in the vacuum of space are thought to be very small, with estimates ranging from 1 in 100,000 to 1 in 100 trillion.

    “You’d have to have a very good counting mechanism to count up to 100 trillion hits in your detector without missing the one hit from a sterile neutrino,” Abazajian says.

    That said, there are a few experiments out there that are giving it a try, using new approaches that don’t rely on direct hits.

    Then there’s the axion.

    Unlike the other dark-matter candidates, axions would be both extremely light—so light that they are better described as waves whose associated fields can spread over kilometers—and extremely cold, Graham says. They are so weakly coupled to other forms of matter that the frantic collisions of particles in the thermal bath of the early universe would have produced hardly any.

    “They would have been produced in a different way than the other dark matter candidates,” Graham says. “Even though the universe was very hot at the time, axions would have been very cold at birth and would stay cold forever, which means that they are absolutely cold dark matter.”

    Even though axions are very light, Graham says, “because they exist at close to absolute zero, the temperature where all motion stops, they are essentially not moving. They’re kind of this ghostly fluid, and everything else moves through it.”

    Searching for dark matter of all kinds

    Some scientists think it will take more than one type of dark matter to account for all the things we see in the universe.

    And in the past few years, as experiments aimed at detecting WIMPs and producing dark matter particles through collisions at the Large Hadron Collider have so far come up empty-handed, the search for dark matter has broadened.

    SixTRack CERN LHC particles

    The proliferation of ideas for searches has been helped by technological advances and clever approaches that could force much lighter and even more exotic dark-matter particles out of hiding.

    Some of those efforts make use of the very clumpiness that dark matter was instrumental in creating.

    Simona Murgia, an experimentalist at The University of California-Irvine (US), led a team looking for signs of collisions between WIMPs and their antiparticles with the Fermi Gamma-ray Space Telescope while a postdoc at the DOE’s SLAC National Accelerator Laboratory.

    Now she’s joined an international team of scientists who will conduct a vast survey of the Southern sky from the Vera C. Rubin Observatory in Chile using the world’s biggest digital camera, which is under construction at SLAC.

    NSF (US) NOIRLab (US) NOAO (US) Vera C. Rubin Observatory [LSST] Telescope currently under construction on the El Peñón peak at Cerro Pachón Chile, a 2,682-meter-high mountain in Coquimbo Region, in northern Chile, alongside the existing NSF (US) NOIRLab (US) NOAO (US) AURA (US) Gemini South Telescope and Southern Astrophysical Research Telescope.

    One of the things this survey will do is get a much better handle on the distribution of dark matter in the universe by looking at how it bends light from the galaxies we can see.

    “It will tell us something about the nature of dark matter in a totally different way,” Murgia says. “The more clumpy its distribution is, the more consistent it is with theories that tell you dark matter is cold.”

    The camera is expected to snap images of about 20 billion galaxies over 10 years, and from those images scientists hope to infer the fundamental nature of the dark matter that shaped them.

    “We don’t only want to know the dark matter is there,” Murgia says. “We do want to understand the cosmology, but we also really want to know what dark matter is.”

    See the full article here .


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    Stem Education Coalition

    Symmetry is a joint Fermilab/SLAC publication.


     
  • richardmitnick 1:47 pm on October 8, 2021 Permalink | Reply
    Tags: "Fermilab boasts new Theory Division", Astrophysics Theory, , , , , Dark Matter, , Fermilab experts on perturbative QCD use high-performance computing to tackle the complexity of simulations for experiments at the Large Hadron Collider., Muon g-2 Theory Initiative and the Muon g-2 experiment, , Particle Theory, , , Superconducting Systems,   

    From DOE’s Fermi National Accelerator Laboratory (US) : “Fermilab boasts new Theory Division” 

    FNAL Art Image
    FNAL Art Image by Angela Gonzales

    From DOE’s Fermi National Accelerator Laboratory (US) , an enduring source of strength for the US contribution to scientific research worldwide.

    October 8, 2021

    Theoretical physics research at Fermi National Particle Accelerator Laboratory has always sparked new ideas and scientific opportunities, while at the same time supporting the large experimental group that conducts research at Fermilab. In recent years, the Theoretical Physics Department has further strengthened its position worldwide as a hub for the high-energy physics theoretical community. The department has now become Fermilab’s newest division, the Theory Division, which officially launched early this year with strong support from HEP.

    This new division seeks to:

    support strategic theory leadership;
    promote new initiatives, as well as strengthen existing ones;
    and leverage U.S. Department of Energy support through partnerships with universities and more.

    “Creating the Theory Division increases the lab’s abilities to stimulate and develop new pathways to discovery,” said Fermilab Director Nigel Lockyer.

    Led by Marcela Carena and her deputy Patrick Fox, this new division features three departments: Particle Theory, Astrophysics Theory and Quantum Theory. “This structure will help us focus our scientific efforts in each area and will allow for impactful contributions to existing and developing programs for the theory community,” said Carena.

    Particle Theory Department

    At the helm of the Particle Theory Department is Andreas Kronfeld. This department studies all aspects of theoretical particle physics, especially those areas inspired by the experimental program—at Fermilab and elsewhere. It coordinates leading national efforts, including the Neutrino Theory Network, and the migration of the lattice gauge theory program to Exascale computing platforms. Lattice quantum chromodynamics, or QCD, experts support the Muon g-2 Theory Initiative, providing a solid theory foundation for the recently announced results of the Muon g-2 experiment.

    Fermilab particle theorists, working with DOE’s Argonne National Laboratory (US) nuclear theorists, are using machine learning for developing novel event generators to precisely model neutrino-nuclear interactions, and employ lattice QCD to model multi-nucleon interactions; both are important for achieving the science goals of DUNE.

    Fermilab experts on perturbative QCD use high-performance computing to tackle the complexity of simulations for experiments at the Large Hadron Collider. Fermilab theorists are strongly involved in the exploration of physics beyond the Standard Model, through model-building, particle physics phenomenology, and formal aspects of quantum field theory.

    Astrophysics Theory Department

    Astrophysics Theory, led by Dan Hooper, consists of researchers who work at the confluence of astrophysics, cosmology and particle physics. Fermilab’s scientists have played a key role in the development of this exciting field worldwide and continue to be deeply involved in supporting the Fermilab cosmic frontier program.

    Key areas of research include dark matter, dark energy, the cosmic microwave background, large-scale structure, neutrino astronomy and axion astrophysics. A large portion of the department’s research involves numerical cosmological simulations of galaxy formation, large-scale structures and gravitational lensing. The department is developing machine-learning tools to help solve these challenging problems.

    Quantum Theory Department

    Led by Roni Harnik, the Quantum Theory Department has researchers working at the interface of quantum information science and high-energy physics. Fermilab theorists are working to harness the developing power of unique quantum information capabilities to address important physics questions, such as the simulation of QCD processes, dynamics in the early universe, and more generally simulating quantum field theories. Quantum-enhanced capabilities also open new opportunities to explore the universe and test theories of new particles, dark matter, gravitational waves and other new physics.

    Scientists in the Quantum Theory Department are developing new algorithms for quantum simulations, and they are proposing novel methods to search for new phenomena using quantum technology, including quantum optics, atomic physics, optomechanical sensors and superconducting systems. The department works in close collaboration with both the Fermilab Superconducting Quantum Materials and Systems Center and the Fermilab Quantum Institute, as well as leads a national QuantISED theory consortium.

    Looking ahead

    The new Theory Division also intends to play a strong role in attracting and inspiring the next generation of theorists, training them in a data-rich environment, as well as promoting an inclusive culture that values diversity.

    “The best part about being a Fermilab theorist,” said Marcela Carena, “is working with brilliant junior scientists and sharing their excitement about exploring new ideas.”

    See the full article here.


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    Please help promote STEM in your local schools.

    Stem Education Coalition

    Fermi National Accelerator Laboratory (US), located just outside Batavia, Illinois, near Chicago, is a United States Department of Energy national laboratory specializing in high-energy particle physics. Since 2007, Fermilab has been operated by the Fermi Research Alliance, a joint venture of the University of Chicago, and the Universities Research Association (URA). Fermilab is a part of the Illinois Technology and Research Corridor.

    Fermilab’s Tevatron was a landmark particle accelerator; until the startup in 2008 of the Large Hadron Collider(CH) near Geneva, Switzerland, it was the most powerful particle accelerator in the world, accelerating antiprotons to energies of 500 GeV, and producing proton-proton collisions with energies of up to 1.6 TeV, the first accelerator to reach one “tera-electron-volt” energy. At 3.9 miles (6.3 km), it was the world’s fourth-largest particle accelerator in circumference. One of its most important achievements was the 1995 discovery of the top quark, announced by research teams using the Tevatron’s CDF and DØ detectors. It was shut down in 2011.

    In addition to high-energy collider physics, Fermilab hosts fixed-target and neutrino experiments, such as MicroBooNE (Micro Booster Neutrino Experiment), NOνA (NuMI Off-Axis νe Appearance) and SeaQuest. Completed neutrino experiments include MINOS (Main Injector Neutrino Oscillation Search), MINOS+, MiniBooNE and SciBooNE (SciBar Booster Neutrino Experiment). The MiniBooNE detector was a 40-foot (12 m) diameter sphere containing 800 tons of mineral oil lined with 1,520 phototube detectors. An estimated 1 million neutrino events were recorded each year. SciBooNE sat in the same neutrino beam as MiniBooNE but had fine-grained tracking capabilities. The NOνA experiment uses, and the MINOS experiment used, Fermilab’s NuMI (Neutrinos at the Main Injector) beam, which is an intense beam of neutrinos that travels 455 miles (732 km) through the Earth to the Soudan Mine in Minnesota and the Ash River, Minnesota, site of the NOνA far detector. In 2017, the ICARUS neutrino experiment was moved from CERN to Fermilab.
    In the public realm, Fermilab is home to a native prairie ecosystem restoration project and hosts many cultural events: public science lectures and symposia, classical and contemporary music concerts, folk dancing and arts galleries. The site is open from dawn to dusk to visitors who present valid photo identification.
    Asteroid 11998 Fermilab is named in honor of the laboratory.
    Weston, Illinois, was a community next to Batavia voted out of existence by its village board in 1966 to provide a site for Fermilab.

    The laboratory was founded in 1969 as the National Accelerator Laboratory; it was renamed in honor of Enrico Fermi in 1974. The laboratory’s first director was Robert Rathbun Wilson, under whom the laboratory opened ahead of time and under budget. Many of the sculptures on the site are of his creation. He is the namesake of the site’s high-rise laboratory building, whose unique shape has become the symbol for Fermilab and which is the center of activity on the campus.
    After Wilson stepped down in 1978 to protest the lack of funding for the lab, Leon M. Lederman took on the job. It was under his guidance that the original accelerator was replaced with the Tevatron, an accelerator capable of colliding protons and antiprotons at a combined energy of 1.96 TeV. Lederman stepped down in 1989. The science education center at the site was named in his honor.
    The later directors include:

    John Peoples, 1989 to 1996
    Michael S. Witherell, July 1999 to June 2005
    Piermaria Oddone, July 2005 to July 2013
    Nigel Lockyer, September 2013 to the present

    Fermilab continues to participate in the work at the Large Hadron Collider (LHC); it serves as a Tier 1 site in the Worldwide LHC Computing Grid.

    DOE’s Fermi National Accelerator Laboratory(US)/MINERvA Reidar Hahn.

    FNAL Don Lincoln.[/caption]

    FNAL Icon

     
  • richardmitnick 4:06 pm on August 12, 2021 Permalink | Reply
    Tags: , , Dark Matter, Dark photons-if they exist-are thought to be force-carrying particles., , New: optomechanical membrane accelerometers, , ,   

    From Symmetry: “Drumming up dark photons” 

    Symmetry Mag

    From Symmetry

    08/03/21
    Mara Johnson-Groh

    1
    Illustration by Sandbox Studio, Chicago with Steve Shanabruch.

    A group of scientists is hoping to detect Dark Matter using a nano-scale drum.

    In the cryogenic-cooled silence of an empty lab, a group of cosmologists, engineers and theoretical physicists hope to someday hear drumbeats.

    The group is searching for a type of theoretical particles called dark photons. And they’re doing it by listening for the particles to tap out a rhythm on a tiny glass drum.

    Dark photons-if they exist-are thought to be force-carrying particles, similar to the regular photons we interact with every day, which carry the electromagnetic force. But unlike massless photons, these dark-matter particles would have a mass, albeit a very small one.

    If they exist in the quantities needed to account for all the dark-matter mass in the universe, dark photons would be so ubiquitous that they would move together like a wave. Individually, dark photons hardly interact with normal matter, but as waves, they would exert a very weak force, theoretical physicists predict.

    The effect would be noticeable only on the smallest scales, but a growing class of nano-instruments specialize in detecting such ultra-small forces on the cusp of quantum limits. Known as optomechanical membrane accelerometers, these devices have previously been used to detect quantum back-action, a weak force important in taking quantum-limited measurements.

    Now, scientists hope to use them to detect the beat of a dark photon wave.

    Drums for dark matter

    Dark matter searches aren’t for pessimists. Despite more than 30 years with no direct detections, physicists are still coming up with new ideas—for both experiments and dark matter candidates. Today, the list of particles is full of superhero and supervillain names like MACHOs, axions, WIMPs, gravitinos and neutralinos. Some models invoke supersymmetry, others superfluids.

    “Right now, the field is in a position where we should leave no rock unturned, because we’ve been looking for years and we haven’t found anything,” says Dalziel Wilson, an assistant professor at the University of Arizona (US) and experimentalist involved with the new search. “So that’s what we’re doing.”

    The idea for using optomechanical devices to detect dark matter was initially made by Swati Singh, an assistant professor at the University of Delaware (US) who currently researches using quantum systems as sensors to search for new physics. After reading proposals to repurpose gravitational-wave detectors to look for dark matter, Singh drew the connection to her previous work with gravitational-wave-sensing mechanical systems.

    “A lot of things we don’t know about—things beyond the Standard Model of particle physics—have signals that are sometimes a very weak force,” Singh says. “As we control more and more devices down to single quanta of motion, we can probe these things and the rest of the universe.”

    To bring her idea to life, Singh formed a multidisciplinary collaboration. Along with her graduate student, Jack Manley, Singh approached Wilson, who has worked with optomechanical resonators for over a decade, and cosmologist Daniel Grin, who specializes in dark-matter candidates.

    Initially, the group wanted to use mechanical detectors to target another type of dark matter, called scalar dark matter. They then realized that dark photons would also affect mechanical detectors, albeit in a different manner.

    A dark photon interacting with a normal atom should slightly alter the position of the atom’s center of mass. So if a wave of dark photons passed, an atom would subtly oscillate back and forth. This effect, though small, could be amplified to the detectable range with optomechanical devices.

    Unlike most dark-matter searches, these detectors are relatively inexpensive and fit on a tabletop. “It turns out, the devices I have in my lab are perfectly capable of searching for this type of dark matter,” Wilson says.

    The group is searching for a type of theoretical particles called dark photons. And they’re doing it by listening for the particles to tap out a rhythm on a tiny glass drum.

    The materials used for the drum were specifically chosen, as dark-photon interactions depend on the density of neutrons in the drum’s atoms. For their first prototype, the group proposed a detector with a membrane made of silicon nitride, less than a micrometer thick, and stretched over a mirror made of beryllium.

    Immersed in a vacuum and cooled down to just 0.01 Kelvin, this type of detector would detect almost no vibration other than that coming from the very tiny dark-photon force, making for a clean signal.

    The detector they designed looks like a drum, but alternative shapes, such as cylinders, cantilevers or balls could work in a similar manner. “In our laboratory, we already have some devices which we think might be more promising,” Wilson says.

    To resonate with dark matter, an optomechanical drum would need to be tuned to the frequency that corresponds to the mass of the dark photon. The trouble is, no one knows exactly what that mass should be.

    “It’s a needle in a haystack. It’s a really, really tiny needle,” says Mitul Dey Chowdhury, a graduate student in Wilson’s lab.

    For now, the group is working to build two detectors. In the coming year or two, they hope to lock their devices away in a quiet room for monthlong runs, during which they will continually listen for the beat of the drum.

    The proposed detector is designed to scan dark-photon frequencies across a large range: from 1 to 100 kilohertz. But it can monitor only a small fraction of that—1/10,000th—at a time.

    Wilson says he hopes their work will inspire other researchers to find optomechanical devices that could be suitable for searching for dark matter. The group has published two peer-reviewed papers, led by Manley, that they hope will interest other groups to join the search. Ideally, a fleet of experiments worldwide, each tuned to a different frequency, would work together to search for dark photons.

    “Right now [this field] is the Wild West,” Wilson says. “I would say maybe in three years we will have some initial results, but it’s very much in its infancy right now.”

    See the full article here .


    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.


    Stem Education Coalition

    Symmetry is a joint Fermilab/SLAC publication.


     
  • richardmitnick 8:25 pm on July 18, 2021 Permalink | Reply
    Tags: "Curiosity and technology drive quest to reveal fundamental secrets of the universe", A very specific particle called a J/psi might provide a clearer picture of what’s going on inside a proton’s gluonic field., , Argonne-driven technology is part of a broad initiative to answer fundamental questions about the birth of matter in the universe and the building blocks that hold it all together., , , , , , Computational Science, , , , , Dark Matter, Developing and fabricating detectors that search for signatures from the early universe or enhance our understanding of the most fundamental of particles., , Electron-Ion Collider (EIC) at DOE's Brookhaven National Laboratory (US) to be built inside the tunnel that currently houses the Relativistic Heavy Ion Collider [RHIC]., Exploring the hearts of protons and neutrons, , , Neutrinoless double beta decay can only happen if the neutrino is its own anti-particle., , , , , , , SLAC National Accelerator Laboratory(US), , ,   

    From DOE’s Argonne National Laboratory (US) : “Curiosity and technology drive quest to reveal fundamental secrets of the universe” 

    Argonne Lab

    From DOE’s Argonne National Laboratory (US)

    July 15, 2021
    John Spizzirri

    Argonne-driven technology is part of a broad initiative to answer fundamental questions about the birth of matter in the universe and the building blocks that hold it all together.

    Imagine the first of our species to lie beneath the glow of an evening sky. An enormous sense of awe, perhaps a little fear, fills them as they wonder at those seemingly infinite points of light and what they might mean. As humans, we evolved the capacity to ask big insightful questions about the world around us and worlds beyond us. We dare, even, to question our own origins.

    “The place of humans in the universe is important to understand,” said physicist and computational scientist Salman Habib. ​“Once you realize that there are billions of galaxies we can detect, each with many billions of stars, you understand the insignificance of being human in some sense. But at the same time, you appreciate being human a lot more.”

    The South Pole Telescope is part of a collaboration between Argonne and a number of national labs and universities to measure the CMB, considered the oldest light in the universe.

    The high altitude and extremely dry conditions of the South Pole keep water vapor from absorbing select light wavelengths.

    With no less a sense of wonder than most of us, Habib and colleagues at the U.S. Department of Energy’s (DOE) Argonne National Laboratory are actively researching these questions through an initiative that investigates the fundamental components of both particle physics and astrophysics.

    The breadth of Argonne’s research in these areas is mind-boggling. It takes us back to the very edge of time itself, to some infinitesimally small portion of a second after the Big Bang when random fluctuations in temperature and density arose, eventually forming the breeding grounds of galaxies and planets.

    It explores the heart of protons and neutrons to understand the most fundamental constructs of the visible universe, particles and energy once free in the early post-Big Bang universe, but later confined forever within a basic atomic structure as that universe began to cool.

    And it addresses slightly newer, more controversial questions about the nature of Dark Matter and Dark Energy, both of which play a dominant role in the makeup and dynamics of the universe but are little understood.
    _____________________________________________________________________________________
    Dark Energy Survey

    Dark Energy Camera [DECam] built at DOE’s Fermi National Accelerator Laboratory(US)

    NOIRLab National Optical Astronomy Observatory(US) Cerro Tololo Inter-American Observatory(CL) Victor M Blanco 4m Telescope which houses the Dark-Energy-Camera – DECam at Cerro Tololo, Chile at an altitude of 7200 feet.

    NOIRLab(US)NSF NOIRLab NOAO (US) Cerro Tololo Inter-American Observatory(CL) approximately 80 km to the East of La Serena, Chile, at an altitude of 2200 meters.

    Timeline of the Inflationary Universe WMAP

    The Dark Energy Survey (DES) is an international, collaborative effort to map hundreds of millions of galaxies, detect thousands of supernovae, and find patterns of cosmic structure that will reveal the nature of the mysterious dark energy that is accelerating the expansion of our Universe. DES began searching the Southern skies on August 31, 2013.

    According to Einstein’s theory of General Relativity, gravity should lead to a slowing of the cosmic expansion. Yet, in 1998, two teams of astronomers studying distant supernovae made the remarkable discovery that the expansion of the universe is speeding up. To explain cosmic acceleration, cosmologists are faced with two possibilities: either 70% of the universe exists in an exotic form, now called dark energy, that exhibits a gravitational force opposite to the attractive gravity of ordinary matter, or General Relativity must be replaced by a new theory of gravity on cosmic scales.

    DES is designed to probe the origin of the accelerating universe and help uncover the nature of dark energy by measuring the 14-billion-year history of cosmic expansion with high precision. More than 400 scientists from over 25 institutions in the United States, Spain, the United Kingdom, Brazil, Germany, Switzerland, and Australia are working on the project. The collaboration built and is using an extremely sensitive 570-Megapixel digital camera, DECam, mounted on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory, high in the Chilean Andes, to carry out the project.

    Over six years (2013-2019), the DES collaboration used 758 nights of observation to carry out a deep, wide-area survey to record information from 300 million galaxies that are billions of light-years from Earth. The survey imaged 5000 square degrees of the southern sky in five optical filters to obtain detailed information about each galaxy. A fraction of the survey time is used to observe smaller patches of sky roughly once a week to discover and study thousands of supernovae and other astrophysical transients.
    _____________________________________________________________________________________

    “And this world-class research we’re doing could not happen without advances in technology,” said Argonne Associate Laboratory Director Kawtar Hafidi, who helped define and merge the different aspects of the initiative.

    “We are developing and fabricating detectors that search for signatures from the early universe or enhance our understanding of the most fundamental of particles,” she added. ​“And because all of these detectors create big data that have to be analyzed, we are developing, among other things, artificial intelligence techniques to do that as well.”

    Decoding messages from the universe

    Fleshing out a theory of the universe on cosmic or subatomic scales requires a combination of observations, experiments, theories, simulations and analyses, which in turn requires access to the world’s most sophisticated telescopes, particle colliders, detectors and supercomputers.

    Argonne is uniquely suited to this mission, equipped as it is with many of those tools, the ability to manufacture others and collaborative privileges with other federal laboratories and leading research institutions to access other capabilities and expertise.

    As lead of the initiative’s cosmology component, Habib uses many of these tools in his quest to understand the origins of the universe and what makes it tick.

    And what better way to do that than to observe it, he said.

    “If you look at the universe as a laboratory, then obviously we should study it and try to figure out what it is telling us about foundational science,” noted Habib. ​“So, one part of what we are trying to do is build ever more sensitive probes to decipher what the universe is trying to tell us.”

    To date, Argonne is involved in several significant sky surveys, which use an array of observational platforms, like telescopes and satellites, to map different corners of the universe and collect information that furthers or rejects a specific theory.

    For example, the South Pole Telescope survey, a collaboration between Argonne and a number of national labs and universities, is measuring the cosmic microwave background (CMB) [above], considered the oldest light in the universe. Variations in CMB properties, such as temperature, signal the original fluctuations in density that ultimately led to all the visible structure in the universe.

    Additionally, the Dark Energy Spectroscopic Instrument and the forthcoming Vera C. Rubin Observatory are specially outfitted, ground-based telescopes designed to shed light on dark energy and dark matter, as well as the formation of luminous structure in the universe.

    DOE’s Lawrence Berkeley National Laboratory(US) DESI spectroscopic instrument on the Mayall 4-meter telescope at Kitt Peak National Observatory, in the Quinlan Mountains in the Arizona-Sonoran Desert on the Tohono O’odham Nation, 88 kilometers 55 mi west-southwest of Tucson, Arizona, Altitude 2,096 m (6,877 ft).

    National Optical Astronomy Observatory (US) Mayall 4 m telescope at NSF NOIRLab NOAO Kitt Peak National Observatory (US) in the Quinlan Mountains in the Arizona-Sonoran Desert on the Tohono O’odham Nation, 88 kilometers 55 mi west-southwest of Tucson, Arizona, Altitude 2,096 m (6,877 ft).

    National Science Foundation(US) NSF (US) NOIRLab NOAO Kitt Peak National Observatory on the Quinlan Mountains in the Arizona-Sonoran Desert on the Tohono O’odham Nation, 88 kilometers (55 mi) west-southwest of Tucson, Arizona, Altitude 2,096 m (6,877 ft).

    National Science Foundation(US) NOIRLab (US) NOAO Kitt Peak National Observatory (US) on Kitt Peak of the Quinlan Mountains in the Arizona-Sonoran Desert on the Tohono O’odham Nation, 88 kilometers (55 mi) west-southwest of Tucson, Arizona, Altitude 2,096 m (6,877 ft). annotated.

    NSF (US) NOIRLab (US) NOAO (US) Vera C. Rubin Observatory [LSST] Telescope currently under construction on the El Peñón peak at Cerro Pachón Chile, a 2,682-meter-high mountain in Coquimbo Region, in northern Chile, alongside the existing NSF (US) NOIRLab (US) NOAO (US) Gemini South Telescope and NSF (US) NOIRLab (US) NOAO (US) Southern Astrophysical Research Telescope.

    Darker matters

    All the data sets derived from these observations are connected to the second component of Argonne’s cosmology push, which revolves around theory and modeling. Cosmologists combine observations, measurements and the prevailing laws of physics to form theories that resolve some of the mysteries of the universe.

    But the universe is complex, and it has an annoying tendency to throw a curve ball just when we thought we had a theory cinched. Discoveries within the past 100 years have revealed that the universe is both expanding and accelerating its expansion — realizations that came as separate but equal surprises.

    Saul Perlmutter (center) [The Supernova Cosmology Project] shared the 2006 Shaw Prize in Astronomy, the 2011 Nobel Prize in Physics, and the 2015 Breakthrough Prize in Fundamental Physics with Brian P. Schmidt (right) and Adam Riess (left) [The High-z Supernova Search Team] for providing evidence that the expansion of the universe is accelerating.

    “To say that we understand the universe would be incorrect. To say that we sort of understand it is fine,” exclaimed Habib. ​“We have a theory that describes what the universe is doing, but each time the universe surprises us, we have to add a new ingredient to that theory.”

    Modeling helps scientists get a clearer picture of whether and how those new ingredients will fit a theory. They make predictions for observations that have not yet been made, telling observers what new measurements to take.

    Habib’s group is applying this same sort of process to gain an ever-so-tentative grasp on the nature of dark energy and dark matter. While scientists can tell us that both exist, that they comprise about 68 and 26% of the universe, respectively, beyond that not much else is known.

    ______________________________________________________________________________________________________________

    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.


    Coma cluster via NASA/ESA Hubble.


    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.
    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.
    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).


    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).


    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970

    Dark Matter Research

    Inside the Axion Dark Matter eXperiment U Washington (US) Credit : Mark Stone U. of Washington. Axion Dark Matter Experiment.
    _____________________________________________________________________________________

    Observations of cosmological structure — the distribution of galaxies and even of their shapes — provide clues about the nature of dark matter, which in turn feeds simple dark matter models and subsequent predictions. If observations, models and predictions aren’t in agreement, that tells scientists that there may be some missing ingredient in their description of dark matter.

    But there are also experiments that are looking for direct evidence of dark matter particles, which require highly sensitive detectors [above]. Argonne has initiated development of specialized superconducting detector technology for the detection of low-mass dark matter particles.

    This technology requires the ability to control properties of layered materials and adjust the temperature where the material transitions from finite to zero resistance, when it becomes a superconductor. And unlike other applications where scientists would like this temperature to be as high as possible — room temperature, for example — here, the transition needs to be very close to absolute zero.

    Habib refers to these dark matter detectors as traps, like those used for hunting — which, in essence, is what cosmologists are doing. Because it’s possible that dark matter doesn’t come in just one species, they need different types of traps.

    “It’s almost like you’re in a jungle in search of a certain animal, but you don’t quite know what it is — it could be a bird, a snake, a tiger — so you build different kinds of traps,” he said.

    Lab researchers are working on technologies to capture these elusive species through new classes of dark matter searches. Collaborating with other institutions, they are now designing and building a first set of pilot projects aimed at looking for dark matter candidates with low mass.

    Tuning in to the early universe

    Amy Bender is working on a different kind of detector — well, a lot of detectors — which are at the heart of a survey of the cosmic microwave background (CMB).

    “The CMB is radiation that has been around the universe for 13 billion years, and we’re directly measuring that,” said Bender, an assistant physicist at Argonne.

    The Argonne-developed detectors — all 16,000 of them — capture photons, or light particles, from that primordial sky through the aforementioned South Pole Telescope, to help answer questions about the early universe, fundamental physics and the formation of cosmic structures.

    Now, the CMB experimental effort is moving into a new phase, CMB-Stage 4 (CMB-S4).

    CMB-S4 is the next-generation ground-based cosmic microwave background experiment.With 21 telescopes at the South Pole and in the Chilean Atacama desert surveying the sky with 550,000 cryogenically-cooled superconducting detectors for 7 years, CMB-S4 will deliver transformative discoveries in fundamental physics, cosmology, astrophysics, and astronomy. CMB-S4 is supported by the Department of Energy Office of Science and the National Science Foundation.

    This larger project tackles even more complex topics like Inflationary Theory, which suggests that the universe expanded faster than the speed of light for a fraction of a second, shortly after the Big Bang.
    _____________________________________________________________________________________
    Inflation

    4
    Alan Guth, from Highland Park High School and M.I.T., who first proposed cosmic inflation
    [caption id="attachment_55311" align="alignnone" width="632"] HPHS Owls

    Lamda Cold Dark Matter Accerated Expansion of The universe http scinotions.com the-cosmic-inflation-suggests-the-existence-of-parallel-universes
    Alex Mittelmann, Coldcreation


    Alan Guth’s notes:

    Alan Guth’s original notes on inflation


    _____________________________________________________________________________________

    3
    A section of a detector array with architecture suitable for future CMB experiments, such as the upcoming CMB-S4 project. Fabricated at Argonne’s Center for Nanoscale Materials, 16,000 of these detectors currently drive measurements collected from the South Pole Telescope. (Image by Argonne National Laboratory.)

    While the science is amazing, the technology to get us there is just as fascinating.

    Technically called transition edge sensing (TES) bolometers, the detectors on the telescope are made from superconducting materials fabricated at Argonne’s Center for Nanoscale Materials, a DOE Office of Science User Facility.

    Each of the 16,000 detectors acts as a combination of very sensitive thermometer and camera. As incoming radiation is absorbed on the surface of each detector, measurements are made by supercooling them to a fraction of a degree above absolute zero. (That’s over three times as cold as Antarctica’s lowest recorded temperature.)

    Changes in heat are measured and recorded as changes in electrical resistance and will help inform a map of the CMB’s intensity across the sky.

    CMB-S4 will focus on newer technology that will allow researchers to distinguish very specific patterns in light, or polarized light. In this case, they are looking for what Bender calls the Holy Grail of polarization, a pattern called B-modes.

    Capturing this signal from the early universe — one far fainter than the intensity signal — will help to either confirm or disprove a generic prediction of inflation.

    It will also require the addition of 500,000 detectors distributed among 21 telescopes in two distinct regions of the world, the South Pole and the Chilean desert. There, the high altitude and extremely dry conditions keep water vapor in the atmosphere from absorbing millimeter wavelength light, like that of the CMB.

    While previous experiments have touched on this polarization, the large number of new detectors will improve sensitivity to that polarization and grow our ability to capture it.

    “Literally, we have built these cameras completely from the ground up,” said Bender. ​“Our innovation is in how to make these stacks of superconducting materials work together within this detector, where you have to couple many complex factors and then actually read out the results with the TES. And that is where Argonne has contributed, hugely.”

    Down to the basics

    Argonne’s capabilities in detector technology don’t just stop at the edge of time, nor do the initiative’s investigations just look at the big picture.

    Most of the visible universe, including galaxies, stars, planets and people, are made up of protons and neutrons. Understanding the most fundamental components of those building blocks and how they interact to make atoms and molecules and just about everything else is the realm of physicists like Zein-Eddine Meziani.

    “From the perspective of the future of my field, this initiative is extremely important,” said Meziani, who leads Argonne’s Medium Energy Physics group. ​“It has given us the ability to actually explore new concepts, develop better understanding of the science and a pathway to enter into bigger collaborations and take some leadership.”

    Taking the lead of the initiative’s nuclear physics component, Meziani is steering Argonne toward a significant role in the development of the Electron-Ion Collider, a new U.S. Nuclear Physics Program facility slated for construction at DOE’s Brookhaven National Laboratory (US).

    Argonne’s primary interest in the collider is to elucidate the role that quarks, anti-quarks and gluons play in giving mass and a quantum angular momentum, called spin, to protons and neutrons — nucleons — the particles that comprise the nucleus of an atom.


    EIC Electron Animation, Inner Proton Motion.
    Electrons colliding with ions will exchange virtual photons with the nuclear particles to help scientists ​“see” inside the nuclear particles; the collisions will produce precision 3D snapshots of the internal arrangement of quarks and gluons within ordinary nuclear matter; like a combination CT/MRI scanner for atoms. (Image by Brookhaven National Laboratory.)

    While we once thought nucleons were the finite fundamental particles of an atom, the emergence of powerful particle colliders, like the Stanford Linear Accelerator Center at Stanford University and the former Tevatron at DOE’s Fermilab, proved otherwise.

    It turns out that quarks and gluons were independent of nucleons in the extreme energy densities of the early universe; as the universe expanded and cooled, they transformed into ordinary matter.

    “There was a time when quarks and gluons were free in a big soup, if you will, but we have never seen them free,” explained Meziani. ​“So, we are trying to understand how the universe captured all of this energy that was there and put it into confined systems, like these droplets we call protons and neutrons.”

    Some of that energy is tied up in gluons, which, despite the fact that they have no mass, confer the majority of mass to a proton. So, Meziani is hoping that the Electron-Ion Collider will allow science to explore — among other properties — the origins of mass in the universe through a detailed exploration of gluons.

    And just as Amy Bender is looking for the B-modes polarization in the CMB, Meziani and other researchers are hoping to use a very specific particle called a J/psi to provide a clearer picture of what’s going on inside a proton’s gluonic field.

    But producing and detecting the J/psi particle within the collider — while ensuring that the proton target doesn’t break apart — is a tricky enterprise, which requires new technologies. Again, Argonne is positioning itself at the forefront of this endeavor.

    “We are working on the conceptual designs of technologies that will be extremely important for the detection of these types of particles, as well as for testing concepts for other science that will be conducted at the Electron-Ion Collider,” said Meziani.

    Argonne also is producing detector and related technologies in its quest for a phenomenon called neutrinoless double beta decay. A neutrino is one of the particles emitted during the process of neutron radioactive beta decay and serves as a small but mighty connection between particle physics and astrophysics.

    “Neutrinoless double beta decay can only happen if the neutrino is its own anti-particle,” said Hafidi. ​“If the existence of these very rare decays is confirmed, it would have important consequences in understanding why there is more matter than antimatter in the universe.”

    Argonne scientists from different areas of the lab are working on the Neutrino Experiment with Xenon Time Projection Chamber (NEXT) collaboration to design and prototype key systems for the collaborative’s next big experiment. This includes developing a one-of-a-kind test facility and an R&D program for new, specialized detector systems.

    “We are really working on dramatic new ideas,” said Meziani. ​“We are investing in certain technologies to produce some proof of principle that they will be the ones to pursue later, that the technology breakthroughs that will take us to the highest sensitivity detection of this process will be driven by Argonne.”

    The tools of detection

    Ultimately, fundamental science is science derived from human curiosity. And while we may not always see the reason for pursuing it, more often than not, fundamental science produces results that benefit all of us. Sometimes it’s a gratifying answer to an age-old question, other times it’s a technological breakthrough intended for one science that proves useful in a host of other applications.

    Through their various efforts, Argonne scientists are aiming for both outcomes. But it will take more than curiosity and brain power to solve the questions they are asking. It will take our skills at toolmaking, like the telescopes that peer deep into the heavens and the detectors that capture hints of the earliest light or the most elusive of particles.

    We will need to employ the ultrafast computing power of new supercomputers. Argonne’s forthcoming Aurora exascale machine will analyze mountains of data for help in creating massive models that simulate the dynamics of the universe or subatomic world, which, in turn, might guide new experiments — or introduce new questions.

    Depiction of ANL ALCF Cray Intel SC18 Shasta Aurora exascale supercomputer, to be built at DOE’s Argonne National Laboratory.

    And we will apply artificial intelligence to recognize patterns in complex observations — on the subatomic and cosmic scales — far more quickly than the human eye can, or use it to optimize machinery and experiments for greater efficiency and faster results.

    “I think we have been given the flexibility to explore new technologies that will allow us to answer the big questions,” said Bender. ​“What we’re developing is so cutting edge, you never know where it will show up in everyday life.”

    Funding for research mentioned in this article was provided by Argonne Laboratory Directed Research and Development; Argonne program development; DOE Office of High Energy Physics: Cosmic Frontier, South Pole Telescope-3G project, Detector R&D; and DOE Office of Nuclear Physics.

    See the full article here .

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    Please help promote STEM in your local schools.

    Stem Education Coalition

    DOE’s Argonne National Laboratory (US) seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their is a science and engineering research national laboratory operated by UChicago Argonne LLC for the United States Department of Energy. The facility is located in Lemont, Illinois, outside of Chicago, and is the largest national laboratory by size and scope in the Midwest.

    Argonne had its beginnings in the Metallurgical Laboratory of the University of Chicago, formed in part to carry out Enrico Fermi’s work on nuclear reactors for the Manhattan Project during World War II. After the war, it was designated as the first national laboratory in the United States on July 1, 1946. In the post-war era the lab focused primarily on non-weapon related nuclear physics, designing and building the first power-producing nuclear reactors, helping design the reactors used by the United States’ nuclear navy, and a wide variety of similar projects. In 1994, the lab’s nuclear mission ended, and today it maintains a broad portfolio in basic science research, energy storage and renewable energy, environmental sustainability, supercomputing, and national security.

    UChicago Argonne, LLC, the operator of the laboratory, “brings together the expertise of the University of Chicago (the sole member of the LLC) with Jacobs Engineering Group Inc.” Argonne is a part of the expanding Illinois Technology and Research Corridor. Argonne formerly ran a smaller facility called Argonne National Laboratory-West (or simply Argonne-West) in Idaho next to the Idaho National Engineering and Environmental Laboratory. In 2005, the two Idaho-based laboratories merged to become the DOE’s Idaho National Laboratory.
    What would become Argonne began in 1942 as the Metallurgical Laboratory at the University of Chicago, which had become part of the Manhattan Project. The Met Lab built Chicago Pile-1, the world’s first nuclear reactor, under the stands of the University of Chicago sports stadium. Considered unsafe, in 1943, CP-1 was reconstructed as CP-2, in what is today known as Red Gate Woods but was then the Argonne Forest of the Cook County Forest Preserve District near Palos Hills. The lab was named after the surrounding forest, which in turn was named after the Forest of Argonne in France where U.S. troops fought in World War I. Fermi’s pile was originally going to be constructed in the Argonne forest, and construction plans were set in motion, but a labor dispute brought the project to a halt. Since speed was paramount, the project was moved to the squash court under Stagg Field, the football stadium on the campus of the University of Chicago. Fermi told them that he was sure of his calculations, which said that it would not lead to a runaway reaction, which would have contaminated the city.

    Other activities were added to Argonne over the next five years. On July 1, 1946, the “Metallurgical Laboratory” was formally re-chartered as Argonne National Laboratory for “cooperative research in nucleonics.” At the request of the U.S. Atomic Energy Commission, it began developing nuclear reactors for the nation’s peaceful nuclear energy program. In the late 1940s and early 1950s, the laboratory moved to a larger location in unincorporated DuPage County, Illinois and established a remote location in Idaho, called “Argonne-West,” to conduct further nuclear research.

    In quick succession, the laboratory designed and built Chicago Pile 3 (1944), the world’s first heavy-water moderated reactor, and the Experimental Breeder Reactor I (Chicago Pile 4), built-in Idaho, which lit a string of four light bulbs with the world’s first nuclear-generated electricity in 1951. A complete list of the reactors designed and, in most cases, built and operated by Argonne can be viewed in the, Reactors Designed by Argonne page. The knowledge gained from the Argonne experiments conducted with these reactors 1) formed the foundation for the designs of most of the commercial reactors currently used throughout the world for electric power generation and 2) inform the current evolving designs of liquid-metal reactors for future commercial power stations.

    Conducting classified research, the laboratory was heavily secured; all employees and visitors needed badges to pass a checkpoint, many of the buildings were classified, and the laboratory itself was fenced and guarded. Such alluring secrecy drew visitors both authorized—including King Leopold III of Belgium and Queen Frederica of Greece—and unauthorized. Shortly past 1 a.m. on February 6, 1951, Argonne guards discovered reporter Paul Harvey near the 10-foot (3.0 m) perimeter fence, his coat tangled in the barbed wire. Searching his car, guards found a previously prepared four-page broadcast detailing the saga of his unauthorized entrance into a classified “hot zone”. He was brought before a federal grand jury on charges of conspiracy to obtain information on national security and transmit it to the public, but was not indicted.

    Not all nuclear technology went into developing reactors, however. While designing a scanner for reactor fuel elements in 1957, Argonne physicist William Nelson Beck put his own arm inside the scanner and obtained one of the first ultrasound images of the human body. Remote manipulators designed to handle radioactive materials laid the groundwork for more complex machines used to clean up contaminated areas, sealed laboratories or caves. In 1964, the “Janus” reactor opened to study the effects of neutron radiation on biological life, providing research for guidelines on safe exposure levels for workers at power plants, laboratories and hospitals. Scientists at Argonne pioneered a technique to analyze the moon’s surface using alpha radiation, which launched aboard the Surveyor 5 in 1967 and later analyzed lunar samples from the Apollo 11 mission.

    In addition to nuclear work, the laboratory maintained a strong presence in the basic research of physics and chemistry. In 1955, Argonne chemists co-discovered the elements einsteinium and fermium, elements 99 and 100 in the periodic table. In 1962, laboratory chemists produced the first compound of the inert noble gas xenon, opening up a new field of chemical bonding research. In 1963, they discovered the hydrated electron.

    High-energy physics made a leap forward when Argonne was chosen as the site of the 12.5 GeV Zero Gradient Synchrotron, a proton accelerator that opened in 1963. A bubble chamber allowed scientists to track the motions of subatomic particles as they zipped through the chamber; in 1970, they observed the neutrino in a hydrogen bubble chamber for the first time.

    Meanwhile, the laboratory was also helping to design the reactor for the world’s first nuclear-powered submarine, the U.S.S. Nautilus, which steamed for more than 513,550 nautical miles (951,090 km). The next nuclear reactor model was Experimental Boiling Water Reactor, the forerunner of many modern nuclear plants, and Experimental Breeder Reactor II (EBR-II), which was sodium-cooled, and included a fuel recycling facility. EBR-II was later modified to test other reactor designs, including a fast-neutron reactor and, in 1982, the Integral Fast Reactor concept—a revolutionary design that reprocessed its own fuel, reduced its atomic waste and withstood safety tests of the same failures that triggered the Chernobyl and Three Mile Island disasters. In 1994, however, the U.S. Congress terminated funding for the bulk of Argonne’s nuclear programs.

    Argonne moved to specialize in other areas, while capitalizing on its experience in physics, chemical sciences and metallurgy. In 1987, the laboratory was the first to successfully demonstrate a pioneering technique called plasma wakefield acceleration, which accelerates particles in much shorter distances than conventional accelerators. It also cultivated a strong battery research program.

    Following a major push by then-director Alan Schriesheim, the laboratory was chosen as the site of the Advanced Photon Source, a major X-ray facility which was completed in 1995 and produced the brightest X-rays in the world at the time of its construction.

    On 19 March 2019, it was reported in the Chicago Tribune that the laboratory was constructing the world’s most powerful supercomputer. Costing $500 million it will have the processing power of 1 quintillion flops. Applications will include the analysis of stars and improvements in the power grid.

    With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science. For more visit http://www.anl.gov.

    About the Advanced Photon Source

    The U. S. Department of Energy Office of Science’s Advanced Photon Source (APS) at Argonne National Laboratory is one of the world’s most productive X-ray light source facilities. The APS provides high-brightness X-ray beams to a diverse community of researchers in materials science, chemistry, condensed matter physics, the life and environmental sciences, and applied research. These X-rays are ideally suited for explorations of materials and biological structures; elemental distribution; chemical, magnetic, electronic states; and a wide range of technologically important engineering systems from batteries to fuel injector sprays, all of which are the foundations of our nation’s economic, technological, and physical well-being. Each year, more than 5,000 researchers use the APS to produce over 2,000 publications detailing impactful discoveries, and solve more vital biological protein structures than users of any other X-ray light source research facility. APS scientists and engineers innovate technology that is at the heart of advancing accelerator and light-source operations. This includes the insertion devices that produce extreme-brightness X-rays prized by researchers, lenses that focus the X-rays down to a few nanometers, instrumentation that maximizes the way the X-rays interact with samples being studied, and software that gathers and manages the massive quantity of data resulting from discovery research at the APS.

    With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science. For more visit http://www.anl.gov.

    About the Advanced Photon Source

    The U. S. Department of Energy Office of Science’s Advanced Photon Source (APS) at Argonne National Laboratory is one of the world’s most productive X-ray light source facilities. The APS provides high-brightness X-ray beams to a diverse community of researchers in materials science, chemistry, condensed matter physics, the life and environmental sciences, and applied research. These X-rays are ideally suited for explorations of materials and biological structures; elemental distribution; chemical, magnetic, electronic states; and a wide range of technologically important engineering systems from batteries to fuel injector sprays, all of which are the foundations of our nation’s economic, technological, and physical well-being. Each year, more than 5,000 researchers use the APS to produce over 2,000 publications detailing impactful discoveries, and solve more vital biological protein structures than users of any other X-ray light source research facility. APS scientists and engineers innovate technology that is at the heart of advancing accelerator and light-source operations. This includes the insertion devices that produce extreme-brightness X-rays prized by researchers, lenses that focus the X-rays down to a few nanometers, instrumentation that maximizes the way the X-rays interact with samples being studied, and software that gathers and manages the massive quantity of data resulting from discovery research at the APS.

    Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science

    Argonne Lab Campus

     
  • richardmitnick 11:31 am on June 23, 2021 Permalink | Reply
    Tags: "Going the distance to confirm a galaxy with almost no dark matter", , , , , Dark Matter,   

    From Yale University (US) : “Going the distance to confirm a galaxy with almost no dark matter” 

    From Yale University (US)

    June 17, 2021

    Media Contact
    Fred Mamoun
    fred.mamoun@yale.edu
    203-436-2643

    By Jim Shelton

    1
    Image: Zili Shen (Yale), Pieter van Dokkum (Yale), Shany Danieli (IAS). National Aeronautics Space Agency (US), European Space Agency [Agence spatiale européenne][Europäische Weltraumorganisation](EU), Space Telescope Science Institute (US), Image processing: Alyssa Pagan (STScI)

    Three years ago, a team of astronomers led by Yale’s Pieter van Dokkum surprised the scientific community with the discovery of a far-off galaxy that contained little or no dark matter.

    The discovery [Nature], made using NASA’s Hubble Space Telescope, had the potential to upend well-established theories about how galaxies form and evolve. That is because dark matter — the invisible scaffolding that accounts for most of the universe’s mass — is considered essential for creating and shaping galaxies.

    But how could a galaxy exist with almost no dark matter? Some astronomers speculated the finding was incorrect. Specifically, they questioned the accuracy of distance measurements from Earth to NGC 1052-DF2 — the galaxy with no dark matter.

    Now, in a new study published in The Astrophysical Journal Letters, van Dokkum and Yale graduate student Zili Shen have pinpointed the distance to DF2 and confirmed the earlier finding.

    “We went out on a limb with our initial Hubble observations of this galaxy in 2018,” said van Dokkum, Yale’s Sol Goldman Family Professor of Astronomy. “I think people were right to question it because it’s such an unusual result. It would be nice if there were a simple explanation, like a wrong distance. But I think it’s more fun and more interesting if it actually is a weird galaxy.”

    Knowing the distance to DF2 is crucial to determining its dark matter content. The calculation of total mass is based on the motions of the stars within the galaxy; their velocities are influenced by the pull of gravity. The researchers found that the observed stellar mass, which depends on distance, matches the galaxy’s overall mass, with minimal room left for dark matter.

    However, if DF2 were closer to Earth, as some astronomers claim, it would be intrinsically fainter and less massive. The galaxy, therefore, would have more dark matter to account for the observed effects of the total mass.

    In the original study, van Dokkum’s team estimated that DF2 was 65 million light-years away. Other scientific teams, working independently, put the distance at 42 million light-years away.

    For their new distance measurement, van Dokkum and Shen used Hubble’s Advanced Camera for Surveys to grab long-exposure images of DF2.

    They targeted aging, red giant stars on the outskirts of DF2 and used the stars’ brightness to calculate the distance from Earth.

    “Studying the brightest red giants is a well-established distance indicator for nearby galaxies,” Shen said.

    They determined the distance at 72 million light-years away, essentially confirming the initial finding.

    “For almost every galaxy we look at, we say that we can’t see most of the mass because it’s dark matter. What you see is only the tip of the iceberg,” van Dokkum said. “But in this case, what you see is what you get. Hubble really shows the entire thing. That’s it. It’s not just the tip of the iceberg, it’s the whole iceberg.”

    Yet the mystery of how a galaxy formed with almost no dark matter remains.

    After van Dokkum’s original study in 2018, former Yale astronomer Shany Danieli, of the Institute for Advanced Study (US), found a second galaxy — NGC 1052-DF4 — that is also nearly devoid of dark matter. Danieli is a co-author of the new study. In 2020, a separate research group found 19 dwarf galaxies that may be lacking in dark matter, as well.

    “There’s a saying that extraordinary claims require extraordinary evidence, and the new distance measurement strongly supports our previous finding that DF2 is missing dark matter,” Shen said. “Now it’s time to move beyond the distance debate and focus on how such galaxies came to exist.”

    See the full article here .

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    Please help promote STEM in your local schools.

    Stem Education Coalition

    About Yale University (US)

    Yale University (US) comprises three major academic components: Yale College (the undergraduate program); the Graduate School of Arts and Sciences; and the professional schools. In addition, Yale encompasses a wide array of centers and programs, libraries, museums, and administrative support offices. Approximately 11,250 students attend Yale.

    Yale University (US) is a private Ivy League research university in New Haven, Connecticut. Founded in 1701 as the Collegiate School, it is the third-oldest institution of higher education in the United States and one of the nine Colonial Colleges chartered before the American Revolution. Collegiate School was renamed Yale College in 1718 to honor the school’s largest benefactor, Elihu Yale.

    Chartered by Connecticut Colony, the Collegiate School was established in 1701 by clergy to educate Congregational ministers. It moved to New Haven in 1716 and shortly after was renamed Yale College in recognition of a gift from East India Company governor Elihu Yale. Originally restricted to theology and sacred languages, the curriculum began to incorporate humanities and sciences by the time of the American Revolution. In the 19th century, the college expanded into graduate and professional instruction, awarding the first PhD in the United States in 1861 and organizing as a university in 1887. Yale’s faculty and student populations grew after 1890 with rapid expansion of the physical campus and scientific research.

    Yale is organized into fourteen constituent schools: the original undergraduate college; the Yale Graduate School of Arts and Sciences; and twelve professional schools. While the university is governed by the Yale Corporation, each school’s faculty oversees its curriculum and degree programs. In addition to a central campus in downtown New Haven, the university owns athletic facilities in western New Haven, a campus in West Haven, Connecticut, and forests and nature preserves throughout New England. As of September 2019, the university’s assets include an endowment valued at $30.3 billion, the second largest endowment of any educational institution in North America. The Yale University Library, serving all constituent schools, holds more than 15 million volumes and is the third-largest academic library in the United States. Students compete in intercollegiate sports as the Yale Bulldogs in the NCAA Division I – Ivy League.

    As of October 2020, 65 Nobel laureates, five Fields Medalists and three Turing award winners have been affiliated with Yale University. In addition, Yale has graduated many notable alumni, including five U.S. Presidents; 19 U.S. Supreme Court Justices; 31 living billionaires; and many heads of state. Hundreds of members of Congress and many U.S. diplomats; 78 MacArthur Fellows; 252 Rhodes Scholars; 123 Marshall Scholars; and nine Mitchell Scholars have been affiliated with the university.

    Yale traces its beginnings to “An Act for Liberty to Erect a Collegiate School”, a would-be charter passed during a meeting in New Haven by the General Court of the Colony of Connecticut on October 9, 1701. The Act was an effort to create an institution to train ministers and lay leadership for Connecticut. Soon after, a group of ten Congregational ministers, Samuel Andrew; Thomas Buckingham; Israel Chauncy; Samuel Mather (nephew of Increase Mather); Rev. James Noyes II (son of James Noyes); James Pierpont; Abraham Pierson; Noadiah Russell; Joseph Webb; and Timothy Woodbridge, all alumni of Harvard University(US), met in the study of Reverend Samuel Russell located in Branford, Connecticut to donate their books to form the school’s library. The group, led by James Pierpont, is now known as “The Founders”.

    Originally known as the “Collegiate School”, the institution opened in the home of its first rector, Abraham Pierson, who is today considered the first president of Yale. Pierson lived in Killingworth (now Clinton). The school moved to Saybrook and then Wethersfield. In 1716, it moved to New Haven, Connecticut.

    Meanwhile, there was a rift forming at Harvard between its sixth president, Increase Mather, and the rest of the Harvard clergy, whom Mather viewed as increasingly liberal, ecclesiastically lax, and overly broad in Church polity. The feud caused the Mathers to champion the success of the Collegiate School in the hope that it would maintain the Puritan religious orthodoxy in a way that Harvard had not.

    Naming and development

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    Coat of arms of the family of Elihu Yale, after whom the university was named in 1718

    In 1718, at the behest of either Rector Samuel Andrew or the colony’s Governor Gurdon Saltonstall, Cotton Mather contacted the successful Boston born businessman Elihu Yale to ask him for financial help in constructing a new building for the college. Through the persuasion of Jeremiah Dummer, Elihu “Eli” Yale, who had made a fortune in Madras while working for the East India Company overseeing its slave trading activities, donated nine bales of goods, which were sold for more than £560, a substantial sum of money at the time. Cotton Mather suggested that the school change its name to “Yale College.” The name Yale is the Anglicized spelling of the Iâl, which the family estate at Plas yn Iâl, near the village of Llandegla, was called.

    Meanwhile, a Harvard graduate working in England convinced some 180 prominent intellectuals to donate books to Yale. The 1714 shipment of 500 books represented the best of modern English literature; science; philosophy; and theology at the time. It had a profound effect on intellectuals at Yale. Undergraduate Jonathan Edwards discovered John Locke’s works and developed his original theology known as the “new divinity.” In 1722 the Rector and six of his friends, who had a study group to discuss the new ideas, announced that they had given up Calvinism, become Arminians, and joined the Church of England. They were ordained in England and returned to the colonies as missionaries for the Anglican faith. Thomas Clapp became president in 1745 and while he attempted to return the college to Calvinist orthodoxy, he did not close the library. Other students found Deist books in the library.

    Curriculum

    Yale College undergraduates follow a liberal arts curriculum with departmental majors and is organized into a social system of residential colleges.

    Yale was swept up by the great intellectual movements of the period—the Great Awakening and the Enlightenment—due to the religious and scientific interests of presidents Thomas Clap and Ezra Stiles. They were both instrumental in developing the scientific curriculum at Yale while dealing with wars, student tumults, graffiti, “irrelevance” of curricula, desperate need for endowment and disagreements with the Connecticut legislature.

    Serious American students of theology and divinity particularly in New England regarded Hebrew as a classical language along with Greek and Latin and essential for the study of the Hebrew Bible in the original words. The Reverend Ezra Stiles, president of the college from 1778 to 1795, brought with him his interest in the Hebrew language as a vehicle for studying ancient Biblical texts in their original language (as was common in other schools) requiring all freshmen to study Hebrew (in contrast to Harvard, where only upperclassmen were required to study the language) and is responsible for the Hebrew phrase אורים ותמים (Urim and Thummim) on the Yale seal. A 1746 graduate of Yale, Stiles came to the college with experience in education, having played an integral role in the founding of Brown University(US), in addition to having been a minister. Stiles’ greatest challenge occurred in July 1779 when British forces occupied New Haven and threatened to raze the college. However, Yale graduate Edmund Fanning, Secretary to the British General in command of the occupation, intervened and the college was saved. In 1803, Fanning was granted an honorary degree LL.D. for his efforts.

    Students

    As the only college in Connecticut from 1701 to 1823, Yale educated the sons of the elite. Punishable offenses for students included cardplaying; tavern-going; destruction of college property; and acts of disobedience to college authorities. During this period, Harvard was distinctive for the stability and maturity of its tutor corps, while Yale had youth and zeal on its side.

    The emphasis on classics gave rise to a number of private student societies, open only by invitation, which arose primarily as forums for discussions of modern scholarship literature and politics. The first such organizations were debating societies: Crotonia in 1738, Linonia in 1753 and Brothers in Unity in 1768. While the societies no longer exist, commemorations to them can be found with names given to campus structures, like Brothers in Unity Courtyard in Branford College.

    19th century

    The Yale Report of 1828 was a dogmatic defense of the Latin and Greek curriculum against critics who wanted more courses in modern languages, mathematics, and science. Unlike higher education in Europe, there was no national curriculum for colleges and universities in the United States. In the competition for students and financial support, college leaders strove to keep current with demands for innovation. At the same time, they realized that a significant portion of their students and prospective students demanded a classical background. The Yale report meant the classics would not be abandoned. During this period, all institutions experimented with changes in the curriculum, often resulting in a dual-track curriculum. In the decentralized environment of higher education in the United States, balancing change with tradition was a common challenge because it was difficult for an institution to be completely modern or completely classical. A group of professors at Yale and New Haven Congregationalist ministers articulated a conservative response to the changes brought about by the Victorian culture. They concentrated on developing a person possessed of religious values strong enough to sufficiently resist temptations from within yet flexible enough to adjust to the ‘isms’ (professionalism; materialism; individualism; and consumerism) tempting him from without. William Graham Sumner, professor from 1872 to 1909, taught in the emerging disciplines of economics and sociology to overflowing classrooms of students. Sumner bested President Noah Porter, who disliked the social sciences and wanted Yale to lock into its traditions of classical education. Porter objected to Sumner’s use of a textbook by Herbert Spencer that espoused agnostic materialism because it might harm students.

    Until 1887, the legal name of the university was “The President and Fellows of Yale College, in New Haven.” In 1887, under an act passed by the Connecticut General Assembly, Yale was renamed to the present “Yale University.”

    Sports and debate

    The Revolutionary War soldier Nathan Hale (Yale 1773) was the prototype of the Yale ideal in the early 19th century: a manly yet aristocratic scholar, equally well-versed in knowledge and sports, and a patriot who “regretted” that he “had but one life to lose” for his country. Western painter Frederic Remington (Yale 1900) was an artist whose heroes gloried in combat and tests of strength in the Wild West. The fictional, turn-of-the-20th-century Yale man Frank Merriwell embodied the heroic ideal without racial prejudice, and his fictional successor Frank Stover in the novel Stover at Yale (1911) questioned the business mentality that had become prevalent at the school. Increasingly the students turned to athletic stars as their heroes, especially since winning the big game became the goal of the student body, and the alumni, as well as the team itself.

    Along with Harvard and Princeton University(US), Yale students rejected British concepts about ‘amateurism’ in sports and constructed athletic programs that were uniquely American, such as football. The Harvard–Yale football rivalry began in 1875. Between 1892, when Harvard and Yale met in one of the first intercollegiate debates and 1909 (the year of the first Triangular Debate of Harvard, Yale and Princeton) the rhetoric, symbolism, and metaphors used in athletics were used to frame these early debates. Debates were covered on front pages of college newspapers and emphasized in yearbooks, and team members even received the equivalent of athletic letters for their jackets. There even were rallies sending off the debating teams to matches, but the debates never attained the broad appeal that athletics enjoyed. One reason may be that debates do not have a clear winner, as is the case in sports, and that scoring is subjective. In addition, with late 19th-century concerns about the impact of modern life on the human body, athletics offered hope that neither the individual nor the society was coming apart.

    In 1909–10, football faced a crisis resulting from the failure of the previous reforms of 1905–06 to solve the problem of serious injuries. There was a mood of alarm and mistrust, and, while the crisis was developing, the presidents of Harvard, Yale, and Princeton developed a project to reform the sport and forestall possible radical changes forced by government upon the sport. President Arthur Hadley of Yale, A. Lawrence Lowell of Harvard, and Woodrow Wilson of Princeton worked to develop moderate changes to reduce injuries. Their attempts, however, were reduced by rebellion against the rules committee and formation of the Intercollegiate Athletic Association. The big three had tried to operate independently of the majority, but changes did reduce injuries.

    Expansion

    Yale expanded gradually, establishing the Yale School of Medicine (1810); Yale Divinity School (1822); Yale Law School (1843); Yale Graduate School of Arts and Sciences (1847); the Sheffield Scientific School (1847); and the Yale School of Fine Arts (1869). In 1887, as the college continued to grow under the presidency of Timothy Dwight V, Yale College was renamed Yale University, with the name Yale College subsequently applied to the undergraduate college. The university would later add the Yale School of Music (1894); the Yale School of Forestry & Environmental Studies (founded by Gifford Pinchot in 1900); the Yale School of Public Health (1915); the Yale School of Nursing (1923); the Yale School of Drama (1955); the Yale Physician Associate Program (1973); the Yale School of Management (1976); and the Jackson School of Global Affairs which will open in 2022. It would also reorganize its relationship with the Sheffield Scientific School.

    Expansion caused controversy about Yale’s new roles. Noah Porter, moral philosopher, was president from 1871 to 1886. During an age of tremendous expansion in higher education, Porter resisted the rise of the new research university, claiming that an eager embrace of its ideals would corrupt undergraduate education. Many of Porter’s contemporaries criticized his administration, and historians since have disparaged his leadership. Levesque argues Porter was not a simple-minded reactionary, uncritically committed to tradition, but a principled and selective conservative. He did not endorse everything old or reject everything new; rather, he sought to apply long-established ethical and pedagogical principles to a rapidly changing culture. He may have misunderstood some of the challenges of his time, but he correctly anticipated the enduring tensions that have accompanied the emergence and growth of the modern university.

    20th century

    Behavioral sciences

    Between 1925 and 1940, philanthropic foundations, especially ones connected with the Rockefellers, contributed about $7 million to support the Yale Institute of Human Relations and the affiliated Yerkes Laboratories of Primate Biology. The money went toward behavioral science research, which was supported by foundation officers who aimed to “improve mankind” under an informal, loosely defined human engineering effort. The behavioral scientists at Yale, led by President James R. Angell and psychobiologist Robert M. Yerkes, tapped into foundation largesse by crafting research programs aimed to investigate, then suggest, ways to control sexual and social behavior. For example, Yerkes analyzed chimpanzee sexual behavior in hopes of illuminating the evolutionary underpinnings of human development and providing information that could ameliorate dysfunction. Ultimately, the behavioral-science results disappointed foundation officers, who shifted their human-engineering funds toward biological sciences.

    Biology

    Slack (2003) compares three groups that conducted biological research at Yale during overlapping periods between 1910 and 1970. Yale proved important as a site for this research. The leaders of these groups were Ross Granville Harrison; Grace E. Pickford; and G. Evelyn Hutchinson and their members included both graduate students and more experienced scientists. All produced innovative research, including the opening of new subfields in embryology; endocrinology; and ecology, respectively, over a long period of time. Harrison’s group is shown to have been a classic research school. Pickford’s and Hutchinson’s were not. Pickford’s group was successful in spite of her lack of departmental or institutional position or power. Hutchinson and his graduate and postgraduate students were extremely productive, but in diverse areas of ecology rather than one focused area of research or the use of one set of research tools. Hutchinson’s example shows that new models for research groups are needed, especially for those that include extensive field research.

    Medicine

    Milton Winternitz led the Yale School of Medicine as its dean from 1920 to 1935. Dedicated to the new scientific medicine established in Germany, he was equally fervent about “social medicine” and the study of humans in their culture and environment. He established the “Yale System” of teaching, with few lectures and fewer exams, and strengthened the full-time faculty system. He also created the graduate-level Yale School of Nursing and the Psychiatry Department and built numerous new buildings. Progress toward his plans for an Institute of Human Relations, envisioned as a refuge where social scientists would collaborate with biological scientists in a holistic study of humankind, unfortunately, lasted for only a few years before the opposition of resentful anti-Semitic colleagues drove him to resign.

    Before World War II, most elite university faculties counted among their numbers few, if any, Jews, blacks, women, or other minorities. Yale was no exception. By 1980, this condition had been altered dramatically, as numerous members of those groups held faculty positions. Almost all members of the Faculty of Arts and Sciences—and some members of other faculties—teach undergraduate courses, more than 2,000 of which are offered annually.

    History and American studies

    The American studies program reflected the worldwide anti-Communist ideological struggle. Norman Holmes Pearson, who worked for the Office of Strategic Studies in London during World War II, returned to Yale and headed the new American studies program. Popular among undergraduates, the program sought to instill a sense of nationalism and national purpose. Also during the 1940s and 1950s, Wyoming millionaire William Robertson Coe made large contributions to the American studies programs at Yale University and at the University of Wyoming. Coe was concerned to celebrate the ‘values’ of the Western United States in order to meet the “threat of communism”.

    Women

    In 1793, Lucinda Foote passed the entrance exams for Yale College, but was rejected by the President on the basis of her gender. Women studied at Yale University as early as 1892, in graduate-level programs at the Yale Graduate School of Arts and Sciences.

    In 1966, Yale began discussions with its sister school Vassar College(US) about merging to foster coeducation at the undergraduate level. Vassar, then all-female and part of the Seven Sisters—elite higher education schools that historically served as sister institutions to the Ivy League when most Ivy League institutions still only admitted men—tentatively accepted, but then declined the invitation. Both schools introduced coeducation independently in 1969. Amy Solomon was the first woman to register as a Yale undergraduate; she was also the first woman at Yale to join an undergraduate society, St. Anthony Hall. The undergraduate class of 1973 was the first class to have women starting from freshman year; at the time, all undergraduate women were housed in Vanderbilt Hall at the south end of Old Campus.

    A decade into co-education, student assault and harassment by faculty became the impetus for the trailblazing lawsuit Alexander v. Yale. In the late 1970s, a group of students and one faculty member sued Yale for its failure to curtail campus sexual harassment by especially male faculty. The case was party built from a 1977 report authored by plaintiff Ann Olivarius, now a feminist attorney known for fighting sexual harassment, A report to the Yale Corporation from the Yale Undergraduate Women’s Caucus. This case was the first to use Title IX to argue and establish that the sexual harassment of female students can be considered illegal sex discrimination. The plaintiffs in the case were Olivarius, Ronni Alexander (now a professor at Kobe University[神戸大学; Kōbe daigaku](JP)); Margery Reifler (works in the Los Angeles film industry), Pamela Price (civil rights attorney in California), and Lisa E. Stone (works at Anti-Defamation League). They were joined by Yale classics professor John “Jack” J. Winkler, who died in 1990. The lawsuit, brought partly by Catharine MacKinnon, alleged rape, fondling, and offers of higher grades for sex by several Yale faculty, including Keith Brion professor of flute and Director of Bands; Political Science professor Raymond Duvall (now at the University of Minnesota(US)); English professor Michael Cooke and coach of the field hockey team, Richard Kentwell. While unsuccessful in the courts, the legal reasoning behind the case changed the landscape of sex discrimination law and resulted in the establishment of Yale’s Grievance Board and the Yale Women’s Center. In March 2011 a Title IX complaint was filed against Yale by students and recent graduates, including editors of Yale’s feminist magazine Broad Recognition, alleging that the university had a hostile sexual climate. In response, the university formed a Title IX steering committee to address complaints of sexual misconduct. Afterwards, universities and colleges throughout the US also established sexual harassment grievance procedures.

    Class

    Yale, like other Ivy League schools, instituted policies in the early 20th century designed to maintain the proportion of white Protestants from notable families in the student body, and was one of the last of the Ivies to eliminate such preferences, beginning with the class of 1970.

    Town–gown relations

    Yale has a complicated relationship with its home city; for example, thousands of students volunteer every year in a myriad of community organizations, but city officials, who decry Yale’s exemption from local property taxes, have long pressed the university to do more to help. Under President Levin, Yale has financially supported many of New Haven’s efforts to reinvigorate the city. Evidence suggests that the town and gown relationships are mutually beneficial. Still, the economic power of the university increased dramatically with its financial success amid a decline in the local economy.

    21st century

    In 2006, Yale and Peking University [北京大学](CN) established a Joint Undergraduate Program in Beijing, an exchange program allowing Yale students to spend a semester living and studying with PKU honor students. In July 2012, the Yale University-PKU Program ended due to weak participation.

    In 2007 outgoing Yale President Rick Levin characterized Yale’s institutional priorities: “First, among the nation’s finest research universities, Yale is distinctively committed to excellence in undergraduate education. Second, in our graduate and professional schools, as well as in Yale College, we are committed to the education of leaders.”

    In 2009, former British Prime Minister Tony Blair picked Yale as one location – the others are Britain’s Durham University(UK) and Universiti Teknologi Mara (MY) – for the Tony Blair Faith Foundation’s United States Faith and Globalization Initiative. As of 2009, former Mexican President Ernesto Zedillo is the director of the Yale Center for the Study of Globalization and teaches an undergraduate seminar, Debating Globalization. As of 2009, former presidential candidate and DNC chair Howard Dean teaches a residential college seminar, Understanding Politics and Politicians. Also in 2009, an alliance was formed among Yale, University College London(UK), and both schools’ affiliated hospital complexes to conduct research focused on the direct improvement of patient care—a growing field known as translational medicine. President Richard Levin noted that Yale has hundreds of other partnerships across the world, but “no existing collaboration matches the scale of the new partnership with UCL”.

    In August 2013, a new partnership with the National University of Singapore(SG) led to the opening of Yale-NUS College in Singapore, a joint effort to create a new liberal arts college in Asia featuring a curriculum including both Western and Asian traditions.

    In 2020, in the wake of protests around the world focused on racial relations and criminal justice reform, the #CancelYale movement demanded that Elihu Yale’s name be removed from Yale University. Yale was president of the East India Company, a trading company that traded slaves as well as goods, and his singularly large donation led to Yale relying on money from the slave-trade for its first scholarships and endowments.

    In August 2020, the US Justice Department claimed that Yale discriminated against Asian and white candidates on the basis of their race. The university, however, denied the report. In early February 2021, under the new Biden administration, the Justice Department withdrew the lawsuit. The group, Students for Fair Admissions, known for a similar lawsuit against Harvard alleging the same issue, plans to refile the lawsuit.

    Yale alumni in Politics

    The Boston Globe wrote that “if there’s one school that can lay claim to educating the nation’s top national leaders over the past three decades, it’s Yale”. Yale alumni were represented on the Democratic or Republican ticket in every U.S. presidential election between 1972 and 2004. Yale-educated Presidents since the end of the Vietnam War include Gerald Ford; George H.W. Bush; Bill Clinton; and George W. Bush. Major-party nominees during this period include Hillary Clinton (2016); John Kerry (2004); Joseph Lieberman (Vice President, 2000); and Sargent Shriver (Vice President, 1972). Other Yale alumni who have made serious bids for the Presidency during this period include Amy Klobuchar (2020); Tom Steyer (2020); Ben Carson (2016); Howard Dean (2004); Gary Hart (1984 and 1988); Paul Tsongas (1992); Pat Robertson (1988); and Jerry Brown (1976, 1980, 1992).

    Several explanations have been offered for Yale’s representation in national elections since the end of the Vietnam War. Various sources note the spirit of campus activism that has existed at Yale since the 1960s, and the intellectual influence of Reverend William Sloane Coffin on many of the future candidates. Yale President Richard Levin attributes the run to Yale’s focus on creating “a laboratory for future leaders,” an institutional priority that began during the tenure of Yale Presidents Alfred Whitney Griswold and Kingman Brewster. Richard H. Brodhead, former dean of Yale College and now president of Duke University(US), stated: “We do give very significant attention to orientation to the community in our admissions, and there is a very strong tradition of volunteerism at Yale.” Yale historian Gaddis Smith notes “an ethos of organized activity” at Yale during the 20th century that led John Kerry to lead the Yale Political Union’s Liberal Party; George Pataki the Conservative Party; and Joseph Lieberman to manage the Yale Daily News. Camille Paglia points to a history of networking and elitism: “It has to do with a web of friendships and affiliations built up in school.” CNN suggests that George W. Bush benefited from preferential admissions policies for the “son and grandson of alumni”, and for a “member of a politically influential family”. New York Times correspondent Elisabeth Bumiller and The Atlantic Monthly correspondent James Fallows credit the culture of community and cooperation that exists between students, faculty, and administration, which downplays self-interest and reinforces commitment to others.

    During the 1988 presidential election, George H. W. Bush (Yale ’48) derided Michael Dukakis for having “foreign-policy views born in Harvard Yard’s boutique”. When challenged on the distinction between Dukakis’ Harvard connection and his own Yale background, he said that, unlike Harvard, Yale’s reputation was “so diffuse, there isn’t a symbol, I don’t think, in the Yale situation, any symbolism in it” and said Yale did not share Harvard’s reputation for “liberalism and elitism”. In 2004 Howard Dean stated, “In some ways, I consider myself separate from the other three (Yale) candidates of 2004. Yale changed so much between the class of ’68 and the class of ’71. My class was the first class to have women in it; it was the first class to have a significant effort to recruit African Americans. It was an extraordinary time, and in that span of time is the change of an entire generation”.

    Leadership

    The President and Fellows of Yale College, also known as the Yale Corporation, or board of trustees, is the governing body of the university and consists of thirteen standing committees with separate responsibilities outlined in the by-laws. The corporation has 19 members: three ex officio members, ten successor trustees, and six elected alumni fellows.

    Yale’s former president Richard C. Levin was, at the time, one of the highest paid university presidents in the United States. Yale’s succeeding president Peter Salovey ranks 40th.

    The Yale Provost’s Office and similar executive positions have launched several women into prominent university executive positions. In 1977, Provost Hanna Holborn Gray was appointed interim President of Yale and later went on to become President of the University of Chicago(US), being the first woman to hold either position at each respective school. In 1994, Provost Judith Rodin became the first permanent female president of an Ivy League institution at the University of Pennsylvania(US). In 2002, Provost Alison Richard became the Vice-Chancellor of the University of Cambridge(UK). In 2003, the Dean of the Divinity School, Rebecca Chopp, was appointed president of Colgate University(US) and later went on to serve as the President of the Swarthmore College(US) in 2009, and then the first female chancellor of the University of Denver(US) in 2014. In 2004, Provost Dr. Susan Hockfield became the President of the Massachusetts Institute of Technology (US). In 2004, Dean of the Nursing school, Catherine Gilliss, was appointed the Dean of Duke University’s School of Nursing and Vice Chancellor for Nursing Affairs. In 2007, Deputy Provost H. Kim Bottomly was named President of Wellesley College(US).

    Similar examples for men who’ve served in Yale leadership positions can also be found. In 2004, Dean of Yale College Richard H. Brodhead was appointed as the President of Duke University(US). In 2008, Provost Andrew Hamilton was confirmed to be the Vice Chancellor of the University of Oxford(UK).

    The university has three major academic components: Yale College (the undergraduate program); the Graduate School of Arts and Sciences; and the professional schools.

    Campus

    Yale’s central campus in downtown New Haven covers 260 acres (1.1 km2) and comprises its main, historic campus and a medical campus adjacent to the Yale–New Haven Hospital. In western New Haven, the university holds 500 acres (2.0 km2) of athletic facilities, including the Yale Golf Course. In 2008, Yale purchased the 17-building, 136-acre (0.55 km2) former Bayer HealthCare complex in West Haven, Connecticut, the buildings of which are now used as laboratory and research space. Yale also owns seven forests in Connecticut, Vermont, and New Hampshire—the largest of which is the 7,840-acre (31.7 km2) Yale-Myers Forest in Connecticut’s Quiet Corner—and nature preserves including Horse Island.

    Yale is noted for its largely Collegiate Gothic campus as well as several iconic modern buildings commonly discussed in architectural history survey courses: Louis Kahn’s Yale Art Gallery and Center for British Art; Eero Saarinen’s Ingalls Rink and Ezra Stiles and Morse Colleges; and Paul Rudolph’s Art & Architecture Building. Yale also owns and has restored many noteworthy 19th-century mansions along Hillhouse Avenue, which was considered the most beautiful street in America by Charles Dickens when he visited the United States in the 1840s. In 2011, Travel+Leisure listed the Yale campus as one of the most beautiful in the United States.

    Many of Yale’s buildings were constructed in the Collegiate Gothic architecture style from 1917 to 1931, financed largely by Edward S. Harkness, including the Yale Drama School. Stone sculpture built into the walls of the buildings portray contemporary college personalities, such as a writer; an athlete; a tea-drinking socialite; and a student who has fallen asleep while reading. Similarly, the decorative friezes on the buildings depict contemporary scenes, like a policemen chasing a robber and arresting a prostitute (on the wall of the Law School) or a student relaxing with a mug of beer and a cigarette. The architect, James Gamble Rogers, faux-aged these buildings by splashing the walls with acid, deliberately breaking their leaded glass windows and repairing them in the style of the Middle Ages and creating niches for decorative statuary but leaving them empty to simulate loss or theft over the ages. In fact, the buildings merely simulate Middle Ages architecture, for though they appear to be constructed of solid stone blocks in the authentic manner, most actually have steel framing as was commonly used in 1930. One exception is Harkness Tower, 216 feet (66 m) tall, which was originally a free-standing stone structure. It was reinforced in 1964 to allow the installation of the Yale Memorial Carillon.

    Other examples of the Gothic style are on the Old Campus by architects like Henry Austin; Charles C. Haight; and Russell Sturgis. Several are associated with members of the Vanderbilt family, including Vanderbilt Hall; Phelps Hall; St. Anthony Hall (a commission for member Frederick William Vanderbilt); the Mason, Sloane and Osborn laboratories; dormitories for the Sheffield Scientific School (the engineering and sciences school at Yale until 1956) and elements of Silliman College, the largest residential college.

    The oldest building on campus, Connecticut Hall (built in 1750), is in the Georgian style. Georgian-style buildings erected from 1929 to 1933 include Timothy Dwight College, Pierson College, and Davenport College, except the latter’s east, York Street façade, which was constructed in the Gothic style to coordinate with adjacent structures.

    Interior of Beinecke Library

    The Beinecke Rare Book and Manuscript Library, designed by Gordon Bunshaft of Skidmore, Owings & Merrill, is one of the largest buildings in the world reserved exclusively for the preservation of rare books and manuscripts. The library includes a six-story above-ground tower of book stacks, filled with 180,000 volumes, that is surrounded by large translucent Vermont marble panels and a steel and granite truss. The panels act as windows and subdue direct sunlight while also diffusing the light in warm hues throughout the interior. Near the library is a sunken courtyard, with sculptures by Isamu Noguchi that are said to represent time (the pyramid), the sun (the circle), and chance (the cube). The library is located near the center of the university in Hewitt Quadrangle, which is now more commonly referred to as “Beinecke Plaza.”

    Alumnus Eero Saarinen, Finnish-American architect of such notable structures as the Gateway Arch in St. Louis; Washington Dulles International Airport main terminal; Bell Labs Holmdel Complex; and the CBS Building in Manhattan, designed Ingalls Rink, dedicated in 1959, as well as the residential colleges Ezra Stiles and Morse. These latter were modeled after the medieval Italian hill town of San Gimignano – a prototype chosen for the town’s pedestrian-friendly milieu and fortress-like stone towers. These tower forms at Yale act in counterpoint to the college’s many Gothic spires and Georgian cupolas.

    Yale’s Office of Sustainability develops and implements sustainability practices at Yale. Yale is committed to reduce its greenhouse gas emissions 10% below 1990 levels by the year 2020. As part of this commitment, the university allocates renewable energy credits to offset some of the energy used by residential colleges. Eleven campus buildings are candidates for LEED design and certification. Yale Sustainable Food Project initiated the introduction of local organic vegetables fruits and beef to all residential college dining halls. Yale was listed as a Campus Sustainability Leader on the Sustainable Endowments Institute’s College Sustainability Report Card 2008, and received a “B+” grade overall.

    Notable nonresidential campus buildings

    Notable nonresidential campus buildings and landmarks include Battell Chapel; Beinecke Rare Book Library; Harkness Tower; Ingalls Rink; Kline Biology Tower; Osborne Memorial Laboratories; Payne Whitney Gymnasium; Peabody Museum of Natural History; Sterling Hall of Medicine; Sterling Law Buildings; Sterling Memorial Library; Woolsey Hall; Yale Center for British Art; Yale University Art Gallery; Yale Art & Architecture Building and the Paul Mellon Centre for Studies in British Art in London.

    Yale’s secret society buildings (some of which are called “tombs”) were built both to be private yet unmistakable. A diversity of architectural styles is represented: Berzelius; Donn Barber in an austere cube with classical detailing (erected in 1908 or 1910); Book and Snake; Louis R. Metcalfe in a Greek Ionic style (erected in 1901); Elihu, architect unknown but built in a Colonial style (constructed on an early 17th-century foundation although the building is from the 18th century); Mace and Chain, in a late colonial early Victorian style (built in 1823). (Interior moulding is said to have belonged to Benedict Arnold); Manuscript Society, King Lui-Wu with Dan Kniley responsible for landscaping and Josef Albers for the brickwork intaglio mural. Buildings constructed in a mid-century modern style: Scroll and Key; Richard Morris Hunt in a Moorish- or Islamic-inspired Beaux-Arts style (erected 1869–70); Skull and Bones; possibly Alexander Jackson Davis or Henry Austin in an Egypto-Doric style utilizing Brownstone (in 1856 the first wing was completed, in 1903 the second wing, 1911 the Neo-Gothic towers in rear garden were completed); St. Elmo, (former tomb) Kenneth M. Murchison, 1912, designs inspired by Elizabethan manor. Current location, brick colonial; and Wolf’s Head, Bertram Grosvenor Goodhue, erected 1923–1924, Collegiate Gothic.

    Relationship with New Haven

    Yale is the largest taxpayer and employer in the City of New Haven, and has often buoyed the city’s economy and communities. Yale, however has consistently opposed paying a tax on its academic property. Yale’s Art Galleries, along with many other university resources, are free and openly accessible. Yale also funds the New Haven Promise program, paying full tuition for eligible students from New Haven public schools.

     
  • richardmitnick 9:50 pm on June 22, 2021 Permalink | Reply
    Tags: , , Dark Matter, Erik Verlinde's theory of emergent gravity, , , , ,   

    From University of Amsterdam [Universiteit van Amsterdam] (NL): Women in STEM-Margot Brouwer “Dark matter: ‘real stuff’ or gravity misunderstood?” 

    22 June 2021

    For many years now, astronomers and physicists have been in a conflict. Is the mysterious Dark Matter that we observe deep in the Universe real, or is what we see the result of subtle deviations from the laws of gravity as we know them? In 2016, Dutch physicist Erik Verlinde proposed a theory of the second kind: emergent gravity. New research, published in Astronomy & Astrophysics this week, pushes the limits of dark matter observations to the unknown outer regions of galaxies, and in doing so re-evaluates several dark matter models and alternative theories of gravity. Measurements of the gravity of 259,000 isolated galaxies show a very close relation between the contributions of dark matter and those of ordinary matter, as predicted in Verlinde’s theory of emergent gravity and an alternative model called Modified Newtonian Dynamics. However, the results also appear to agree with a computer simulation of the Universe that assumes that dark matter is ‘real stuff’.

    1
    In the centre of the image the elliptical galaxy NGC5982, and to the right the spiral galaxy NGC5985. These two types of galaxies turn out to behave very differently when it comes to the extra gravity – and therefore possibly the dark matter – in their outer regions. Images: Bart Delsaert (www.delsaert.com).

    The new research was carried out by an international team of astronomers, led by Margot Brouwer (University of Groningen [Rijksuniversiteit Groningen] (NL) and UvA). Further important roles were played by Kyle Oman (RUG and Durham University (UK)) and Edwin Valentijn (RUG). In 2016, Brouwer also performed a first test of Verlinde’s ideas [MNRAS]; this time, Verlinde himself also joined the research team.

    Matter or gravity?

    So far, dark matter has never been observed directly – hence the name. What astronomers observe in the night sky are the consequences of matter that is potentially present: bending of starlight, stars that move faster than expected, and even effects on the motion of entire galaxies. Without a doubt all of these effects are caused by gravity, but the question is: are we truly observing additional gravity, caused by invisible matter, or are the laws of gravity themselves the thing that we haven’t fully understood yet?

    To answer this question, the new research uses a similar method to the one used in the original test in 2016. Brouwer and her colleagues make use of an ongoing series of photographic measurements that started ten years ago: the KiloDegree Survey (KiDS), performed using ESO’s VLT Survey Telescope in Chili.

    In these observations one measures how starlight from far away galaxies is bent by gravity on its way to our telescopes. Whereas in 2016 the measurements of such ‘lens effects’ only covered an area of about 180 square degrees on the night sky, in the mean time this has been extended to about 1000 square degrees – allowing the researchers to measure the distribution of gravity in around a million different galaxies.

    Comparative testing

    Brouwer and her colleagues selected over 259,000 isolated galaxies, for which they were able to measure the so-called ‘Radial Acceleration Relation’ (RAR). This RAR compares the amount of gravity expected based on the visible matter in the galaxy, to the amount of gravity that is actually present – in other words: the result shows how much ‘extra’ gravity there is, in addition to that due to normal matter. Until now, the amount of extra gravity had only been determined in the outer regions of galaxies by observing the motions of stars, and in a region about five times larger by measuring the rotational velocity of cold gas. Using the lensing effects of gravity, the researchers were now able to determine the RAR at gravitational strengths which were one hundred times smaller, allowing them to penetrate much deeper into the regions far outside the individual galaxies.

    This made it possible to measure the extra gravity extremely precisely – but is this gravity the result of invisible dark matter, or do we need to improve our understanding of gravity itself? Author Kyle Oman indicates that the assumption of ‘real stuff’ at least partially appears to work: “In our research, we compare the measurements to four different theoretical models: two that assume the existence of dark matter and form the base of computer simulations of our universe, and two that modify the laws of gravity – Erik Verlinde’s model of emergent gravity and the so-called ‘Modified Newtonian Dynamics’ or MOND. One of the two dark matter simulations, MICE, makes predictions that match our measurements very nicely. It came as a surprise to us that the other simulation, BAHAMAS, led to very different predictions. That the predictions of the two models differed at all was already surprising, since the models are so similar. But moreover, we would have expected that if a difference would show up, BAHAMAS was going to perform best. BAHAMAS is a much more detailed model than MICE, approaching our current understanding of how galaxies form in a universe with dark matter much closer. Still, MICE performs better if we compare its predictions to our measurements. In the future, based on our findings, we want to further investigate what causes the differences between the simulations.”

    Young and old galaxies

    Thus it seems that, at least one dark matter model does appear to work. However, the alternative models of gravity also predict the measured RAR. A standoff, it seems – so how do we find out which model is correct? Margot Brouwer, who led the research team, continues: “Based on our tests, our original conclusion was that the two alternative gravity models and MICE matched the observations reasonably well. However, the most exciting part was yet to come: because we had access to over 259,000 galaxies, we could divide them into several types – relatively young, blue spiral galaxies versus relatively old, red elliptical galaxies.” Those two types of galaxies come about in very different ways: red elliptical galaxies form when different galaxies interact, for example when two blue spiral galaxies pass by each other closely, or even collide. As a result, the expectation within the particle theory of dark matter is that the ratio between regular and dark matter in the different types of galaxies can vary. Models such as Verlinde’s theory and MOND on the other hand do not make use of dark matter particles, and therefore predict a fixed ratio between the expected and measured gravity in the two types of galaxies – that is, independent of their type. Brouwer: “We discovered that the RARs for the two types of galaxies differed significantly. That would be a strong hint towards the existence of dark matter as a particle.”

    2
    A plot showing the Radial Acceleration Relation (RAR). The background is an image of the elliptical galaxy M87, showing the distance to the centre of the galaxy. The plot shows how the measurements range from high gravitational acceleration in the centre of the galaxy, to low gravitational acceleration in the far outer regions. Image: Chris Mihos (Case Western Reserve University (US)) / European Southern Observatory [Observatoire européen austral][Europäische Südsternwarte] (EU) (CL).

    However, there is a caveat: gas. Many galaxies are probably surrounded by a diffuse cloud of hot gas, which is very difficult to observe. If it were the case that there is hardly any gas around young blue spiral galaxies, but that old red elliptical galaxies live in a large cloud of gas – of roughly the same mass as the stars themselves – then that could explain the difference in the RAR between the two types. To reach a final judgement on the measured difference, one would therefore also need to measure the amounts of diffuse gas – and this is exactly what is not possible using the KiDS telescopes. Other measurements have been done for a small group of around one hundred galaxies, and these measurements indeed found more gas around elliptical galaxies, but it is still unclear how representative those measurements are for the 259,000 galaxies that were studied in the current research.

    Dark matter for the win?

    If it turns out that extra gas cannot explain the difference between the two types of galaxies, then the results of the measurements are easier to understand in terms of dark matter particles than in terms of alternative models of gravity. But even then, the matter is not settled yet. While the measured differences are hard to explain using MOND, Erik Verlinde still sees a way out for his own model. Verlinde: “My current model only applies to static, isolated, spherical galaxies, so it cannot be expected to distinguish the different types of galaxies. I view these results as a challenge and inspiration to develop an asymmetric, dynamical version of my theory, in which galaxies with a different shape and history can have a different amount of ‘apparent dark matter’.”

    Therefore, even after the new measurements, the dispute between dark matter and alternative gravity theories is not settled yet. Still, the new results are a major step forward: if the measured difference in gravity between the two types of galaxies is correct, then the ultimate model, whichever one that is, will have to be precise enough to explain this difference. This means in particular that many existing models can be discarded, which considerably thins out the landscape of possible explanations. On top of that, the new research shows that systematic measurements of the hot gas around galaxies are necessary. Edwin Valentijn formulates is as follows: “As observational astronomers, we have reached the point where we are able to measure the extra gravity around galaxies more precisely than we can measure the amount of visible matter. The counterintuitive conclusion is that we must first measure the presence of ordinary matter in the form of hot gas around galaxies, before future telescopes such as Euclid can finally solve the mystery of dark matter.”

    ______________________________________________________________________________________________________________

    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.


    Coma cluster via NASA/ESA Hubble.


    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.
    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.
    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).


    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).


    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970

    Dark Matter Research

    Inside the ADMX experiment hall at the University of Washington Credit Mark Stone U. of Washington. Axion Dark Matter Experiment

    _____________________________________________________________________________________

    See the full article here.

    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    University of Amsterdam [Universiteit van Amsterdam] (NL) is a public research university located in Amsterdam, Netherlands. The UvA is one of two large, publicly funded research universities in the city, the other being the Free University of Amsterdam [Vrije Universiteit Amsterdam] (NL). Established in 1632 by municipal authorities and later renamed for the city of Amsterdam, the University of Amsterdam is the third-oldest university in the Netherlands. It is one of the largest research universities in Europe with 31,186 students, 4,794 staff, 1,340 PhD students and an annual budget of €600 million. It is the largest university in the Netherlands by enrollment. The main campus is located in central Amsterdam, with a few faculties located in adjacent boroughs. The university is organised into seven faculties: Humanities, Social and Behavioural Sciences, Economics and Business, Science, Law, Medicine, Dentistry.

    The University of Amsterdam has produced six Nobel Laureates and five prime ministers of the Netherlands. The university has been placed in the top 100 universities in the world by five major ranking tables. By the QS World University Rankings it was ranked 55th in the world, 14th in Europe, and 1st in the Netherlands in 2022. The UvA was placed in the top 50 worldwide in seven fields in the 2011 QS World University Rankings in the fields of linguistics, sociology, philosophy, geography, science, Economics and econometrics, and accountancy and finance. In 2018 and 2019 the two departments of Media and Communication were commonly ranked 1st in the world by subject by QS Ranking.

    Close ties are harbored with other institutions internationally through its membership in the League of European Research Universities (LERU), the Institutional Network of the Universities from the Capitals of Europe (EU) (UNICA), European University Association (EUA) (EU), the International Student Exchange Programs (ISEP), and Universitas 21.

    Research

    The University of Amsterdam is one of Europe’s largest research universities, with over 7,900 scientific publications in 2010. The university spends about €100 million on research each year via direct funding. It receives an additional €23 million via indirect funding and about €49 million from commercial partners. Faculty members often receive research prizes and grants, such as those from the Dutch Research Council (NWO – Nederlandse Organisatie voor Wetenschappelijk Onderzoek)(NL). Research is organized into fifteen research priority areas and 28 research institutes within the faculties oversee this research.

    The University of Amsterdam has an extensive central University Library (UBA), with over four million volumes. In addition, a number of departments have their own libraries. The main university library is located in the city center. It contains over four million books, 70,000 manuscripts, 500,000 letters, and 125,000 maps, as well as special collections of the Department of Rare and Precious Works, the Manuscript and Writing Museum, the Bibliotheca Rosenthaliana on Jewish history and culture, and the Department of Documentation on Social Movements. Three reading rooms are available for students to study in quiet. In addition to the main University Library, there are approximately 70 departmental libraries spread throughout the center of Amsterdam. The university’s printing arm, the Amsterdam University Press, has a publishing list of over 1,400 titles in both Dutch and English.

     
  • richardmitnick 8:41 pm on June 14, 2021 Permalink | Reply
    Tags: "Dark matter is slowing the spin of the Milky Way’s galactic bar", , , , , , Dark Matter, Dark Matter Backround, , ,   

    From University College London (UK) and From University of Oxford (UK): “Dark matter is slowing the spin of the Milky Way’s galactic bar” 

    UCL bloc

    From University College London (UK)

    and

    U Oxford bloc

    From University of Oxford (UK)

    14 June 2021

    Mark Greaves
    +44 (0)7990 675947
    m.greaves@ucl.ac.uk

    The spin of the Milky Way’s galactic bar, which is made up of billions of clustered stars, has slowed by about a quarter since its formation, according to a new study by University College London (UK) and University of Oxford (UK) researchers.

    For 30 years, astrophysicists have predicted such a slowdown, but this is the first time it has been measured.

    The researchers say it gives a new type of insight into the nature of Dark Matter, which acts like a counterweight slowing the spin.

    In the study, published in the MNRAS, researchers analysed Gaia space telescope observations of a large group of stars, the Hercules stream, which are in resonance with the bar – that is, they revolve around the galaxy at the same rate as the bar’s spin.

    These stars are gravitationally trapped by the spinning bar. The same phenomenon occurs with Jupiter’s Trojan and Greek asteroids, which orbit Jupiter’s Lagrange points (ahead and behind Jupiter). If the bar’s spin slows down, these stars would be expected to move further out in the galaxy, keeping their orbital period matched to that of the bar’s spin.

    The researchers found that the stars in the stream carry a chemical fingerprint – they are richer in heavier elements (called metals in astronomy), proving that they have travelled away from the galactic centre, where stars and star-forming gas are about 10 times as rich in metals compared to the outer galaxy.

    Using this data, the team inferred that the bar – made up of billions of stars and trillions of solar masses – had slowed down its spin by at least 24% since it first formed.

    Co-author Dr Ralph Schoenrich (UCL Physics & Astronomy) said: “Astrophysicists have long suspected that the spinning bar at the centre of our galaxy is slowing down, but we have found the first evidence of this happening.

    “The counterweight slowing this spin must be dark matter. Until now, we have only been able to infer dark matter by mapping the gravitational potential of galaxies and subtracting the contribution from visible matter.

    “Our research provides a new type of measurement of dark matter – not of its gravitational energy, but of its inertial mass (the dynamical response), which slows the bar’s spin.”

    Co-author and PhD student Rimpei Chiba, of the University of Oxford, said: “Our finding offers a fascinating perspective for constraining the nature of dark matter, as different models will change this inertial pull on the galactic bar.

    “Our finding also poses a major problem for alternative gravity theories – as they lack dark matter in the halo, they predict no, or significantly too little slowing of the bar.”

    The Milky Way, like other galaxies, is thought to be embedded in a ‘halo’ of dark matter that extends well beyond its visible edge.

    Dark matter is invisible and its nature is unknown, but its existence is inferred from galaxies behaving as if they were shrouded in significantly more mass than we can see. There is thought to be about five times as much dark matter in the Universe as ordinary, visible matter.

    Alternative gravity theories such as modified Newtonian dynamics reject the idea of dark matter, instead seeking to explain discrepancies by tweaking Einstein’s theory of general relativity.

    The Milky Way is a barred spiral galaxy, with a thick bar of stars in the middle and spiral arms extending through the disc outside the bar. The bar rotates in the same direction as the galaxy.

    The research received support from the Royal Society, the Takenaka Scholarship Foundation, and the Science and Technology Facilities Council (STFC).

    ______________________________________________________________________________________________________________

    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.


    Coma cluster via NASA/ESA Hubble.


    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.
    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.
    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).


    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).


    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970

    Dark Matter Research

    Inside the ADMX experiment hall at the University of Washington Credit Mark Stone U. of Washington. Axion Dark Matter Experiment

    _____________________________________________________________________________________

    See the full article here .

    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    U Oxford campus

    University of Oxford is a collegiate research university in Oxford, England. There is evidence of teaching as early as 1096, making it the oldest university in the English-speaking world and the world’s second-oldest university in continuous operation. It grew rapidly from 1167 when Henry II banned English students from attending the University of Paris [Université de Paris](FR). After disputes between students and Oxford townsfolk in 1209, some academics fled north-east to Cambridge where they established what became the University of Cambridge (UK). The two English ancient universities share many common features and are jointly referred to as Oxbridge.

    The university is made up of thirty-nine semi-autonomous constituent colleges, six permanent private halls, and a range of academic departments which are organised into four divisions. All the colleges are self-governing institutions within the university, each controlling its own membership and with its own internal structure and activities. All students are members of a college. It does not have a main campus, and its buildings and facilities are scattered throughout the city centre. Undergraduate teaching at Oxford consists of lectures, small-group tutorials at the colleges and halls, seminars, laboratory work and occasionally further tutorials provided by the central university faculties and departments. Postgraduate teaching is provided predominantly centrally.

    Oxford operates the world’s oldest university museum, as well as the largest university press in the world and the largest academic library system nationwide. In the fiscal year ending 31 July 2019, the university had a total income of £2.45 billion, of which £624.8 million was from research grants and contracts.

    Oxford has educated a wide range of notable alumni, including 28 prime ministers of the United Kingdom and many heads of state and government around the world. As of October 2020, 72 Nobel Prize laureates, 3 Fields Medalists, and 6 Turing Award winners have studied, worked, or held visiting fellowships at the University of Oxford, while its alumni have won 160 Olympic medals. Oxford is the home of numerous scholarships, including the Rhodes Scholarship, one of the oldest international graduate scholarship programmes.

    To be a member of the university, all students, and most academic staff, must also be a member of a college or hall. There are thirty-nine colleges of the University of Oxford (including Reuben College, planned to admit students in 2021) and six permanent private halls (PPHs), each controlling its membership and with its own internal structure and activities. Not all colleges offer all courses, but they generally cover a broad range of subjects.

    The colleges are:

    All-Souls College
    Balliol College
    Brasenose College
    Christ Church College
    Corpus-Christi College
    Exeter College
    Green-Templeton College
    Harris-Manchester College
    Hertford College
    Jesus College
    Keble College
    Kellogg College
    Lady-Margaret-Hall
    Linacre College
    Lincoln College
    Magdalen College
    Mansfield College
    Merton College
    New College
    Nuffield College
    Oriel College
    Pembroke College
    Queens College
    Reuben College
    St-Anne’s College
    St-Antony’s College
    St-Catherines College
    St-Cross College
    St-Edmund-Hall College
    St-Hilda’s College
    St-Hughs College
    St-John’s College
    St-Peters College
    Somerville College
    Trinity College
    University College

    UCL campus

    Established in 1826, as London University by founders inspired by the radical ideas of Jeremy Bentham, University College London (UK) was the first university institution to be established in London, and the first in England to be entirely secular and to admit students regardless of their religion. University College London (UK) also makes contested claims to being the third-oldest university in England and the first to admit women. In 1836, University College London (UK) became one of the two founding colleges of the University of London, which was granted a royal charter in the same year. It has grown through mergers, including with the Institute of Ophthalmology (in 1995); the Institute of Neurology (in 1997); the Royal Free Hospital Medical School (in 1998); the Eastman Dental Institute (in 1999); the School of Slavonic and East European Studies (in 1999); the School of Pharmacy (in 2012) and the Institute of Education (in 2014).

    University College London (UK) has its main campus in the Bloomsbury area of central London, with a number of institutes and teaching hospitals elsewhere in central London and satellite campuses in Queen Elizabeth Olympic Park in Stratford, east London and in Doha, Qatar. University College London (UK) is organised into 11 constituent faculties, within which there are over 100 departments, institutes and research centres. University College London (UK) operates several museums and collections in a wide range of fields, including the Petrie Museum of Egyptian Archaeology and the Grant Museum of Zoology and Comparative Anatomy, and administers the annual Orwell Prize in political writing. In 2019/20, UCL had around 43,840 students and 16,400 staff (including around 7,100 academic staff and 840 professors) and had a total income of £1.54 billion, of which £468 million was from research grants and contracts.

    University College London (UK) is a member of numerous academic organisations, including the Russell Group(UK) and the League of European Research Universities, and is part of UCL Partners, the world’s largest academic health science centre, and is considered part of the “golden triangle” of elite, research-intensive universities in England.

    University College London (UK) has many notable alumni, including the respective “Fathers of the Nation” of India; Kenya and Mauritius; the founders of Ghana; modern Japan; Nigeria; the inventor of the telephone; and one of the co-discoverers of the structure of DNA. UCL academics discovered five of the naturally occurring noble gases; discovered hormones; invented the vacuum tube; and made several foundational advances in modern statistics. As of 2020, 34 Nobel Prize winners and 3 Fields medalists have been affiliated with UCL as alumni, faculty or researchers.

    History

    University College London (UK) was founded on 11 February 1826 under the name London University, as an alternative to the Anglican universities of the University of Oxford(UK) and University of Cambridge(UK). London University’s first Warden was Leonard Horner, who was the first scientist to head a British university.

    Despite the commonly held belief that the philosopher Jeremy Bentham was the founder of University College London (UK), his direct involvement was limited to the purchase of share No. 633, at a cost of £100 paid in nine installments between December 1826 and January 1830. In 1828 he did nominate a friend to sit on the council, and in 1827 attempted to have his disciple John Bowring appointed as the first professor of English or History, but on both occasions his candidates were unsuccessful. This suggests that while his ideas may have been influential, he himself was less so. However, Bentham is today commonly regarded as the “spiritual father” of University College London (UK), as his radical ideas on education and society were the inspiration to the institution’s founders, particularly the Scotsmen James Mill (1773–1836) and Henry Brougham (1778–1868).

    In 1827, the Chair of Political Economy at London University was created, with John Ramsay McCulloch as the first incumbent, establishing one of the first departments of economics in England. In 1828 the university became the first in England to offer English as a subject and the teaching of Classics and medicine began. In 1830, London University founded the London University School, which would later become University College School. In 1833, the university appointed Alexander Maconochie, Secretary to the Royal Geographical Society, as the first professor of geography in the British Isles. In 1834, University College Hospital (originally North London Hospital) opened as a teaching hospital for the university’s medical school.

    1836 to 1900 – University College, London

    In 1836, London University was incorporated by royal charter under the name University College, London. On the same day, the University of London was created by royal charter as a degree-awarding examining board for students from affiliated schools and colleges, with University College and King’s College, London being named in the charter as the first two affiliates.[23]

    The Slade School of Fine Art was founded as part of University College in 1871, following a bequest from Felix Slade.

    In 1878, the University College London (UK) gained a supplemental charter making it the first British university to be allowed to award degrees to women. The same year University College London (UK) admitted women to the faculties of Arts and Law and of Science, although women remained barred from the faculties of Engineering and of Medicine (with the exception of courses on public health and hygiene). While University College London (UK) claims to have been the first university in England to admit women on equal terms to men, from 1878, the University of Bristol(UK) also makes this claim, having admitted women from its foundation (as a college) in 1876. Armstrong College, a predecessor institution of Newcastle University (UK), also allowed women to enter from its foundation in 1871, although none actually enrolled until 1881. Women were finally admitted to medical studies during the First World War in 1917, although limitations were placed on their numbers after the war ended.

    In 1898, Sir William Ramsay discovered the elements krypton; neon; and xenon whilst professor of chemistry at University College London (UK).

    1900 to 1976 – University of London, University College

    In 1900, the University College London (UK) was reconstituted as a federal university with new statutes drawn up under the University of London Act 1898. UCL, along with a number of other colleges in London, became a school of the University of London. While most of the constituent institutions retained their autonomy, University College London (UK) was merged into the University in 1907 under the University College London (Transfer) Act 1905 and lost its legal independence. Its formal name became University College London (UK), University College, although for most informal and external purposes the name “University College, London” (or the initialism UCL) was still used.

    1900 also saw the decision to appoint a salaried head of the college. The first incumbent was Carey Foster, who served as Principal (as the post was originally titled) from 1900 to 1904. He was succeeded by Gregory Foster (no relation), and in 1906 the title was changed to Provost to avoid confusion with the Principal of the University of London. Gregory Foster remained in post until 1929. In 1906, the Cruciform Building was opened as the new home for University College Hospital.

    As it acknowledged and apologized for in 2021, University College London (UK) played “a fundamental role in the development, propagation and legitimisation of eugenics” during the first half of the 20th century. Among the prominent eugenicists who taught at University College London (UK) were Francis Galton, who coined the term “eugenics”, and Karl Pearson, and eugenics conferences were held at UCL until 2017.

    University College London (UK) sustained considerable bomb damage during the Second World War, including the complete destruction of the Great Hall and the Carey Foster Physics Laboratory. Fires gutted the library and destroyed much of the main building, including the dome. The departments were dispersed across the country to Aberystwyth; Bangor; Gwynedd; University of Cambridge (UK) ; University of Oxford (UK); Rothamsted near Harpenden; Hertfordshire; and Sheffield, with the administration at Stanstead Bury near Ware, Hertfordshire. The first UCL student magazine, Pi, was published for the first time on 21 February 1946. The Institute of Jewish Studies relocated to UCL in 1959.

    The Mullard Space Science Laboratory(UK) was established in 1967. In 1973, UCL became the first international node to the precursor of the internet, the ARPANET.

    Although University College London (UK) was among the first universities to admit women on the same terms as men, in 1878, the college’s senior common room, the Housman Room, remained men-only until 1969. After two unsuccessful attempts, a motion was passed that ended segregation by sex at University College London (UK). This was achieved by Brian Woledge (Fielden Professor of French at University College London (UK) from 1939 to 1971) and David Colquhoun, at that time a young lecturer in pharmacology.

    1976 to 2005 – University College London (UK)

    In 1976, a new charter restored University College London (UK) ‘s legal independence, although still without the power to award its own degrees. Under this charter the college became formally known as University College London (UK). This name abandoned the comma used in its earlier name of “University College, London”.

    In 1986, University College London (UK) merged with the Institute of Archaeology. In 1988, University College London (UK) merged with the Institute of Laryngology & Otology; the Institute of Orthopaedics; the Institute of Urology & Nephrology; and Middlesex Hospital Medical School.

    In 1993, a reorganisation of the University of London (UK) meant that University College London (UK) and other colleges gained direct access to government funding and the right to confer University of London degrees themselves. This led to University College London (UK) being regarded as a de facto university in its own right.

    In 1994, the University College London (UK) Hospitals NHS Trust was established. University College London (UK) merged with the College of Speech Sciences and the Institute of Ophthalmology in 1995; the Institute of Child Health and the School of Podiatry in 1996; and the Institute of Neurology in 1997. In 1998, UCL merged with the Royal Free Hospital Medical School to create the Royal Free and University College Medical School (renamed the University College London (UK) Medical School in October 2008). In 1999, UCL merged with the School of Slavonic and East European Studies and the Eastman Dental Institute.

    The University College London (UK) Jill Dando Institute of Crime Science, the first university department in the world devoted specifically to reducing crime, was founded in 2001.

    Proposals for a merger between University College London (UK) and Imperial College London(UK) were announced in 2002. The proposal provoked strong opposition from University College London (UK) teaching staff and students and the AUT union, which criticised “the indecent haste and lack of consultation”, leading to its abandonment by University College London (UK) provost Sir Derek Roberts. The blogs that helped to stop the merger are preserved, though some of the links are now broken: see David Colquhoun’s blog and the Save University College London (UK) blog, which was run by David Conway, a postgraduate student in the department of Hebrew and Jewish studies.

    The London Centre for Nanotechnology was established in 2003 as a joint venture between University College London (UK) and Imperial College London (UK). They were later joined by King’s College London(UK) in 2018.

    Since 2003, when University College London (UK) professor David Latchman became master of the neighbouring Birkbeck, he has forged closer relations between these two University of London colleges, and personally maintains departments at both. Joint research centres include the UCL/Birkbeck Institute for Earth and Planetary Sciences; the University College London (UK) /Birkbeck/IoE Centre for Educational Neuroscience; the University College London (UK) /Birkbeck Institute of Structural and Molecular Biology; and the Birkbeck- University College London (UK) Centre for Neuroimaging.

    2005 to 2010

    In 2005, University College London (UK) was finally granted its own taught and research degree awarding powers and all University College London (UK) students registered from 2007/08 qualified with University College London (UK) degrees. Also in 2005, University College London (UK) adopted a new corporate branding under which the name University College London (UK) was replaced by the initialism UCL in all external communications. In the same year, a major new £422 million building was opened for University College Hospital on Euston Road, the University College London (UK) Ear Institute was established and a new building for the University College London (UK) School of Slavonic and East European Studies was opened.

    In 2007, the University College London (UK) Cancer Institute was opened in the newly constructed Paul O’Gorman Building. In August 2008, University College London (UK) formed UCL Partners, an academic health science centre, with Great Ormond Street Hospital for Children NHS Trust; Moorfields Eye Hospital NHS Foundation Trust; Royal Free London NHS Foundation Trust; and University College London Hospitals NHS Foundation Trust. In 2008, University College London (UK) established the University College London (UK) School of Energy & Resources in Adelaide, Australia, the first campus of a British university in the country. The School was based in the historic Torrens Building in Victoria Square and its creation followed negotiations between University College London (UK) Vice Provost Michael Worton and South Australian Premier Mike Rann.

    In 2009, the Yale UCL Collaborative was established between University College London (UK); UCL Partners; Yale University(US); Yale School of Medicine; and Yale – New Haven Hospital. It is the largest collaboration in the history of either university, and its scope has subsequently been extended to the humanities and social sciences.

    2010 to 2015

    In June 2011, the mining company BHP Billiton agreed to donate AU$10 million to University College London (UK) to fund the establishment of two energy institutes – the Energy Policy Institute; based in Adelaide, and the Institute for Sustainable Resources, based in London.

    In November 2011, University College London (UK) announced plans for a £500 million investment in its main Bloomsbury campus over 10 years, as well as the establishment of a new 23-acre campus next to the Olympic Park in Stratford in the East End of London. It revised its plans of expansion in East London and in December 2014 announced to build a campus (UCL East) covering 11 acres and provide up to 125,000m^2 of space on Queen Elizabeth Olympic Park. UCL East will be part of plans to transform the Olympic Park into a cultural and innovation hub, where University College London (UK) will open its first school of design, a centre of experimental engineering and a museum of the future, along with a living space for students.

    The School of Pharmacy, University of London merged with University College London (UK) on 1 January 2012, becoming the University College London (UK) School of Pharmacy within the Faculty of Life Sciences. In May 2012, University College London (UK), Imperial College London and the semiconductor company Intel announced the establishment of the Intel Collaborative Research Institute for Sustainable Connected Cities, a London-based institute for research into the future of cities.

    In August 2012, University College London (UK) received criticism for advertising an unpaid research position; it subsequently withdrew the advert.

    University College London (UK) and the Institute of Education formed a strategic alliance in October 2012, including co-operation in teaching, research and the development of the London schools system. In February 2014, the two institutions announced their intention to merge, and the merger was completed in December 2014.

    In September 2013, a new Department of Science, Technology, Engineering and Public Policy (STEaPP) was established within the Faculty of Engineering, one of several initiatives within the university to increase and reflect upon the links between research and public sector decision-making.

    In October 2013, it was announced that the Translation Studies Unit of Imperial College London would move to University College London (UK), becoming part of the University College London (UK) School of European Languages, Culture and Society. In December 2013, it was announced that University College London (UK) and the academic publishing company Elsevier would collaborate to establish the UCL Big Data Institute. In January 2015, it was announced that University College London (UK) had been selected by the UK government as one of the five founding members of the Alan Turing Institute(UK) (together with the universities of Cambridge, University of Edinburgh(SCL), Oxford and University of Warwick(UK)), an institute to be established at the British Library to promote the development and use of advanced mathematics, computer science, algorithms and big data.

    2015 to 2020

    In August 2015, the Department of Management Science and Innovation was renamed as the School of Management and plans were announced to greatly expand University College London (UK) ‘s activities in the area of business-related teaching and research. The school moved from the Bloomsbury campus to One Canada Square in Canary Wharf in 2016.

    University College London (UK) established the Institute of Advanced Studies (IAS) in 2015 to promote interdisciplinary research in humanities and social sciences. The prestigious annual Orwell Prize for political writing moved to the IAS in 2016.

    In June 2016 it was reported in Times Higher Education that as a result of administrative errors hundreds of students who studied at the UCL Eastman Dental Institute between 2005–06 and 2013–14 had been given the wrong marks, leading to an unknown number of students being attributed with the wrong qualifications and, in some cases, being failed when they should have passed their degrees. A report by University College London (UK) ‘s Academic Committee Review Panel noted that, according to the institute’s own review findings, senior members of University College London (UK) staff had been aware of issues affecting students’ results but had not taken action to address them. The Review Panel concluded that there had been an apparent lack of ownership of these matters amongst the institute’s senior staff.

    In December 2016 it was announced that University College London (UK) would be the hub institution for a new £250 million national dementia research institute, to be funded with £150 million from the Medical Research Council and £50 million each from Alzheimer’s Research UK and the Alzheimer’s Society.

    In May 2017 it was reported that staff morale was at “an all time low”, with 68% of members of the academic board who responded to a survey disagreeing with the statement ” University College London (UK) is well managed” and 86% with “the teaching facilities are adequate for the number of students”. Michael Arthur, the Provost and President, linked the results to the “major change programme” at University College London (UK). He admitted that facilities were under pressure following growth over the past decade, but said that the issues were being addressed through the development of UCL East and rental of other additional space.

    In October 2017 University College London (UK) ‘s council voted to apply for university status while remaining part of the University of London. University College London (UK) ‘s application to become a university was subject to Parliament passing a bill to amend the statutes of the University of London, which received royal assent on 20 December 2018.

    The University College London (UK) Adelaide satellite campus closed in December 2017, with academic staff and student transferring to the University of South Australia(AU). As of 2019 UniSA and University College London (UK) are offering a joint masters qualification in Science in Data Science (international).

    In 2018, University College London (UK) opened UCL at Here East, at the Queen Elizabeth Olympic Park, offering courses jointly between the Bartlett Faculty of the Built Environment and the Faculty of Engineering Sciences. The campus offers a variety of undergraduate and postgraduate master’s degrees, with the first undergraduate students, on a new Engineering and Architectural Design MEng, starting in September 2018. It was announced in August 2018 that a £215 million contract for construction of the largest building in the UCL East development, Marshgate 1, had been awarded to Mace, with building to begin in 2019 and be completed by 2022.

    In 2017 University College London (UK) disciplined an IT administrator who was also the University and College Union (UCU) branch secretary for refusing to take down an unmoderated staff mailing list. An employment tribunal subsequently ruled that he was engaged in union activities and thus this disciplinary action was unlawful. As of June 2019 University College London (UK) is appealing this ruling and the UCU congress has declared this to be a “dispute of national significance”.

    2020 to present

    In 2021 University College London (UK) formed a strategic partnership with Facebook AI Research (FAIR), including the creation of a new PhD programme.

    Research

    University College London (UK) has made cross-disciplinary research a priority and orientates its research around four “Grand Challenges”, Global Health, Sustainable Cities, Intercultural Interaction and Human Wellbeing.

    In 2014/15, University College London (UK) had a total research income of £427.5 million, the third-highest of any British university (after the University of Oxford and Imperial College London). Key sources of research income in that year were BIS research councils (£148.3 million); UK-based charities (£106.5 million); UK central government; local/health authorities and hospitals (£61.5 million); EU government bodies (£45.5 million); and UK industry, commerce and public corporations (£16.2 million). In 2015/16, University College London (UK) was awarded a total of £85.8 million in grants by UK research councils, the second-largest amount of any British university (after the University of Oxford), having achieved a 28% success rate. For the period to June 2015, University College London (UK) was the fifth-largest recipient of Horizon 2020 EU research funding and the largest recipient of any university, with €49.93 million of grants received. University College London (UK) also had the fifth-largest number of projects funded of any organisation, with 94.

    According to a ranking of universities produced by SCImago Research Group University College London (UK) is ranked 12th in the world (and 1st in Europe) in terms of total research output. According to data released in July 2008 by ISI Web of Knowledge, University College London (UK) is the 13th most-cited university in the world (and most-cited in Europe). The analysis covered citations from 1 January 1998 to 30 April 2008, during which 46,166 UCL research papers attracted 803,566 citations. The report covered citations in 21 subject areas and the results revealed some of University College London (UK) ‘s key strengths, including: Clinical Medicine (1st outside North America); Immunology (2nd in Europe); Neuroscience & Behaviour (1st outside North America and 2nd in the world); Pharmacology & Toxicology (1st outside North America and 4th in the world); Psychiatry & Psychology (2nd outside North America); and Social Sciences, General (1st outside North America).

    University College London (UK) submitted a total of 2,566 staff across 36 units of assessment to the 2014 Research Excellence Framework (REF) assessment, in each case the highest number of any UK university (compared with 1,793 UCL staff submitted to the 2008 Research Assessment Exercise (RAE 2008)). In the REF results 43% of University College London (UK) ‘s submitted research was classified as 4* (world-leading); 39% as 3* (internationally excellent); 15% as 2* (recognised internationally) and 2% as 1* (recognised nationally), giving an overall GPA of 3.22 (RAE 2008: 4* – 27%, 3* – 39%, 2* – 27% and 1* – 6%). In rankings produced by Times Higher Education based upon the REF results, University College London (UK) was ranked 1st overall for “research power” and joint 8th for GPA (compared to 4th and 7th respectively in equivalent rankings for the RAE 2008).

     
  • richardmitnick 11:59 am on June 13, 2021 Permalink | Reply
    Tags: " 'Sterile neutrinos' may be portal to the dark side", “BeEST”: “Beryllium Electron-capture with Superconducting Tunnel junctions.”, , Dark Matter, , , , Using nuclear decay in high-rate quantum sensors in the search for "sterile neutrinos".   

    From DOE’s Lawrence Livermore National Laboratory (US) : “Sterile neutrinos may be portal to the dark side” 

    From DOE’s Lawrence Livermore National Laboratory (US)

    4.27.21 [Just now in social media.]

    Anne M Stark
    stark8@llnl.gov
    925-422-9799

    1
    Schematic of the “BeEST” experiment. Radioactive beryllium-7 is implanted into the superconducting sensor. Precision measurements of the decay products could indicate the presence of hypothesized “sterile neutrinos”.

    “Sterile neutrinos” are theoretically predicted new particles that offer an intriguing possibility in the quest for understanding the Dark Matter in our universe.

    Unlike the known “active” neutrinos in the Standard Model (SM) of Particle Physics, these sterile neutrinos do not interact with normal matter as they move through space, making them very difficult to detect.

    A team of interdisciplinary researchers, led by Lawrence Livermore National Laboratory (LLNL) and the Colorado School of Mines (US), has demonstrated the power of using nuclear decay in high-rate quantum sensors in the search for sterile neutrinos. The findings are the first measurements of their kind.

    The research has been featured recently as a DOE Office of Science Highlight and will jump-start an extended project to look for one of the most promising candidates for dark matter, the strange unidentified material that permeates the universe and accounts for 85 percent of its total mass.

    The experiment involves implanting radioactive beryllium-7 atoms into superconducting sensors developed at LLNL and has been nicknamed the “BeEST” for “Beryllium Electron-capture with Superconducting Tunnel junctions.” When the beryllium-7 decays by electron capture into lithium-7 and a neutrino, the neutrino escapes from the sensor, but the recoil energy of the lithium-7 provides a measure of the neutrino mass. If a heavy sterile neutrino with mass mc^2 were to be generated in a faction of the decays, the lithium-7 recoil energy would be reduced and produce a measurable signal, even though the elusive neutrino itself is not detected directly.

    With a measurement time of just 28 days using a single sensor, the data excludes the existence of sterile neutrinos in the mass range of 100 to 850 kiloelectronvolts down to a 0.01 percent level of mixing with the active neutrinos — better than all previous decay experiments in this range. In addition, simulations on LLNL supercomputers have helped the team understand some of the materials effects in the detector that need to be accounted for to gain confidence in potential sterile neutrino detection events.

    “This research effort lays the groundwork for even more powerful searches for these new particles using large arrays of sensors with new superconducting materials,” said LLNL scientist Stephan Friedrich, lead author of the research appearing in Physical Review Letters.

    The Standard Model of Particle Physics is one of the crowning achievements in modern science and the cornerstone of current subatomic studies. Despite its success, the SM is known to be incomplete, and physics beyond the Standard Model (BSM) is required to develop a full description of the universe. The neutrino sector offers an intriguing avenue for BSM physics as the observation of nonzero neutrino masses currently provides the only confirmed violation of the SM as it was originally constructed.

    “Sterile neutrinos are exciting because they are strong candidates for so-called ‘warm’ dark matter, and they also may help to address the origin of the matter-antimatter asymmetry of the universe,” Friedrich said.

    Other LLNL authors include Geonbo Kim, Vincenzo Lordi and Amit Samanta.

    This research is funded by the Laboratory Directed Research and Development program.

    _____________________________________________________________________________________

    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.


    Coma cluster via NASA/ESA Hubble.


    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.
    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.
    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).


    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).


    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970. https://home.dtm.ciw.edu.


    _____________________________________________________________________________________

    Dark Matter Research

    See the full article here .


    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    Operated by Lawrence Livermore National Security, LLC, for the Department of Energy’s National Nuclear Security Administration

    DOE’s Lawrence Livermore National Laboratory (LLNL) (US) is an American federal research facility in Livermore, California, United States, founded by the University of California-Berkeley (US) in 1952. A Federally Funded Research and Development Center (FFRDC), it is primarily funded by the U.S. Department of Energy (DOE) and managed and operated by Lawrence Livermore National Security, LLC (LLNS), a partnership of the University of California, Bechtel, BWX Technologies, AECOM, and Battelle Memorial Institute in affiliation with the Texas A&M University System (US). In 2012, the laboratory had the synthetic chemical element livermorium named after it.
    LLNL is self-described as “a premier research and development institution for science and technology applied to national security.” Its principal responsibility is ensuring the safety, security and reliability of the nation’s nuclear weapons through the application of advanced science, engineering and technology. The Laboratory also applies its special expertise and multidisciplinary capabilities to preventing the proliferation and use of weapons of mass destruction, bolstering homeland security and solving other nationally important problems, including energy and environmental security, basic science and economic competitiveness.

    The Laboratory is located on a one-square-mile (2.6 km^2) site at the eastern edge of Livermore. It also operates a 7,000 acres (28 km2) remote experimental test site, called Site 300, situated about 15 miles (24 km) southeast of the main lab site. LLNL has an annual budget of about $1.5 billion and a staff of roughly 5,800 employees.

    LLNL was established in 1952 as the University of California Radiation Laboratory at Livermore, an offshoot of the existing UC Radiation Laboratory at Berkeley. It was intended to spur innovation and provide competition to the nuclear weapon design laboratory at Los Alamos in New Mexico, home of the Manhattan Project that developed the first atomic weapons. Edward Teller and Ernest Lawrence, director of the Radiation Laboratory at Berkeley, are regarded as the co-founders of the Livermore facility.

    The new laboratory was sited at a former naval air station of World War II. It was already home to several UC Radiation Laboratory projects that were too large for its location in the Berkeley Hills above the UC campus, including one of the first experiments in the magnetic approach to confined thermonuclear reactions (i.e. fusion). About half an hour southeast of Berkeley, the Livermore site provided much greater security for classified projects than an urban university campus.

    Lawrence tapped 32-year-old Herbert York, a former graduate student of his, to run Livermore. Under York, the Lab had four main programs: Project Sherwood (the magnetic-fusion program), Project Whitney (the weapons-design program), diagnostic weapon experiments (both for the DOE’s Los Alamos National Laboratory(US) and Livermore laboratories), and a basic physics program. York and the new lab embraced the Lawrence “big science” approach, tackling challenging projects with physicists, chemists, engineers, and computational scientists working together in multidisciplinary teams. Lawrence died in August 1958 and shortly after, the university’s board of regents named both laboratories for him, as the Lawrence Radiation Laboratory.

    Historically, the DOE’s Lawrence Berkeley National Laboratory (US) and Livermore laboratories have had very close relationships on research projects, business operations, and staff. The Livermore Lab was established initially as a branch of the Berkeley laboratory. The Livermore lab was not officially severed administratively from the Berkeley lab until 1971. To this day, in official planning documents and records, Lawrence Berkeley National Laboratory is designated as Site 100, Lawrence Livermore National Lab as Site 200, and LLNL’s remote test location as Site 300.

    The laboratory was renamed Lawrence Livermore Laboratory (LLL) in 1971. On October 1, 2007 LLNS assumed management of LLNL from the University of California, which had exclusively managed and operated the Laboratory since its inception 55 years before. The laboratory was honored in 2012 by having the synthetic chemical element livermorium named after it. The LLNS takeover of the laboratory has been controversial. In May 2013, an Alameda County jury awarded over $2.7 million to five former laboratory employees who were among 430 employees LLNS laid off during 2008.The jury found that LLNS breached a contractual obligation to terminate the employees only for “reasonable cause.” The five plaintiffs also have pending age discrimination claims against LLNS, which will be heard by a different jury in a separate trial.[6] There are 125 co-plaintiffs awaiting trial on similar claims against LLNS. The May 2008 layoff was the first layoff at the laboratory in nearly 40 years.

    On March 14, 2011, the City of Livermore officially expanded the city’s boundaries to annex LLNL and move it within the city limits. The unanimous vote by the Livermore city council expanded Livermore’s southeastern boundaries to cover 15 land parcels covering 1,057 acres (4.28 km^2) that comprise the LLNL site. The site was formerly an unincorporated area of Alameda County. The LLNL campus continues to be owned by the federal government.

    LLNL/NIF

    DOE Seal

    NNSA

     
  • richardmitnick 9:05 am on May 31, 2021 Permalink | Reply
    Tags: "Looking deep into the universe", , , , Dark Matter, , HIRAX telescope in the Karoo semidesert in South Africa, , , , ,   

    From Swiss Federal Institute of Technology in Zürich [ETH Zürich] [Eidgenössische Technische Hochschule Zürich](CH): “Looking deep into the universe” 

    From Swiss Federal Institute of Technology in Zürich [ETH Zürich] [Eidgenössische Technische Hochschule Zürich](CH)

    31.05.2021
    Felix Würsten

    How is matter distributed within our universe? And what is the mysterious substance known as dark energy made of? HIRAX, a new large telescope array comprising hundreds of small radio telescopes, should provide some answers. Among those instrumental in developing the system are physicists from ETH Zürich.

    2
    Hartebeesthoek Radio Astronomy Observatory, located west of Johannesburg South Africa.
    How the final expansion of the HIRAX telescope in the Karoo semidesert in South Africa should look once completed. (Image: Cynthia Chiang / HIRAX.)

    “It’s an exciting project,” says Alexandre Refregier, Professor of Physics at ETH Zürich, as he considers the futuristic-​looking visualisation from South Africa. The image shows a scene in the middle of the Karoo semidesert, far away from larger settlements, with rows upon rows of more than 1,000 parabolic reflectors all directed towards the same point. At first glance, one might assume this is a solar power station, but it’s actually a large radio telescope that over the coming years should provide cosmologists with new insights into the makeup and history of our universe.

    Key element: hydrogen

    HIRAX stands for Hydrogen Intensity and Real-​time Analysis eXperiment and marks the start of a new chapter in the exploration of the universe. The new large telescope will collect radio signals within a frequency range of 400 to 800 MHz. These signals will make it possible to measure the distribution of hydrogen in the universe on a large scale. “If we can use hydrogen, the most common element in the universe, to discover how matter is distributed in space, we could then draw conclusions about what dark matter and dark energy are made of,” Refregier explains.

    Dark Energy and Dark Matter are two mysterious components that together make up the vast majority of the universe. They play a major role in the formation of structures and in the universe’s accelerated expansion. But experts remain puzzled about exactly what dark energy and dark matter are made of. HIRAX should help home in on the precise nature of these two components. The researchers also hope that the new system will deliver insights into fast radio bursts and pulsars.

    Combining hundreds of individual signals

    Not only will Refregier and his team be involved in the scientific analysis of the data, the professor is also helping to develop the new system together with his postdoc Devin Crichton and engineer Thierry Viant. “HIRAX is a remarkable undertaking, not just from a scientific point of view, but also because it represents a significant technological challenge,” Refregier says. As part of their subproject in collaboration with scientists from the University of Geneva [Université de Genève](CH), the ETH researchers are developing what’s known as a digital correlator, which will combine the signals recorded by each of the approximately six-​metre telescopes. “Rather than consisting of a single large telescope, the HIRAX array is made up of numerous smaller radio telescopes that are correlated with each other,” Refregier says. “This enables us to build a telescope with a collection surface and resolution much greater than a measuring device with only one parabolic reflector.”

    Tested in Switzerland

    The physicists first tested the technology for the digital corrector in Switzerland using a pilot system. To do so, they used the two historic radio telescopes housed at the Bleien facility in the Swiss canton of Aargau. They will now use the results of these tests to develop a digital corrector capable of linking 256 reflectors. “The HIRAX telescope is being set up in stages, which allows us to develop and refine the technology we need as we go along,” Refregier says. The funding required for this subproject was recently secured.

    For their digital correlator, the ETH Zurich physicists are using high-​performance graphics processing units that were originally developed for video and gaming applications. The researchers are also breaking new ground when it comes to calibration. To synchronise the measurement signals received by the individual antennas, they use a radio signal transmitted by a drone. It is crucial to pinpoint the position of these signals so that the telescope can then provide the required precision.

    An ideal location

    It’s no accident that the HIRAX telescope is being installed in the Karoo semidesert. As a protected area, it is still largely free of disruptive signals from mobile communications antennas. “It’s actually quite ironic,” Refregier says. “On the one hand, mobile communications technology is a massive help in developing telescopes. On the other, that same technology makes life difficult for radio astronomers because mobile communications antennas transmit within similar frequency ranges.

    Another reason why the Karoo region is an ideal location is that this is also where part of the planned Square Kilometre Array will be erected.


    Once completed, this will be the world’s largest radio telescope, connecting systems in South Africa and Australia and representing yet another giant leap forward in radio astronomy. “Despite its remote position, the Karoo location is well connected by power and data lines,” Refregier says. In this respect, the undertaking presents a challenge because the new telescope will generate 6.5 terabytes of data every second. “This is why we’re going to install the digital corrector directly on site, so that the amount of data can first be reduced before it is sent somewhere else for further processing,” Refregier says.

    Opening the door for the next large-​scale project

    A collaboration among numerous other universities from different countries, the HIRAX project is also important with respect to research policy. First, it strengthens the collaboration between South Africa and Switzerland, enabling young scientists from the former to conduct research in the latter. Second, Refregier says he is grateful that the work we are doing on the development of HIRAX is opening the door to Switzerland’s participation in the Square Kilometre Array: “This means that we can do our part to ensure that Swiss universities are involved in this pioneering project and can keep pace with the latest developments in radio astronomy.”

    _____________________________________________________________________________________
    Dark Energy Survey

    ]

    The Dark Energy Survey (DES) is an international, collaborative effort to map hundreds of millions of galaxies, detect thousands of supernovae, and find patterns of cosmic structure that will reveal the nature of the mysterious dark energy that is accelerating the expansion of our Universe. DES began searching the Southern skies on August 31, 2013.

    According to Einstein’s theory of General Relativity, gravity should lead to a slowing of the cosmic expansion. Yet, in 1998, two teams of astronomers studying distant supernovae made the remarkable discovery that the expansion of the universe is speeding up. To explain cosmic acceleration, cosmologists are faced with two possibilities: either 70% of the universe exists in an exotic form, now called dark energy, that exhibits a gravitational force opposite to the attractive gravity of ordinary matter, or General Relativity must be replaced by a new theory of gravity on cosmic scales.

    DES is designed to probe the origin of the accelerating universe and help uncover the nature of dark energy by measuring the 14-billion-year history of cosmic expansion with high precision. More than 400 scientists from over 25 institutions in the United States, Spain, the United Kingdom, Brazil, Germany, Switzerland, and Australia are working on the project. The collaboration built and is using an extremely sensitive 570-Megapixel digital camera, DECam, mounted on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory, high in the Chilean Andes, to carry out the project.

    Over six years (2013-2019), the DES collaboration used 758 nights of observation to carry out a deep, wide-area survey to record information from 300 million galaxies that are billions of light-years from Earth. The survey imaged 5000 square degrees of the southern sky in five optical filters to obtain detailed information about each galaxy. A fraction of the survey time is used to observe smaller patches of sky roughly once a week to discover and study thousands of supernovae and other astrophysical transients.
    _____________________________________________________________________________________

    Dark Matter Background
    Fritz Zwicky discovered Dark Matter in the 1930s when observing the movement of the Coma Cluster., Vera Rubin a Woman in STEM denied the Nobel, some 30 years later, did most of the work on Dark Matter.

    Fritz Zwicky from http:// palomarskies.blogspot.com.


    Coma cluster via NASA/ESA Hubble.


    In modern times, it was astronomer Fritz Zwicky, in the 1930s, who made the first observations of what we now call dark matter. His 1933 observations of the Coma Cluster of galaxies seemed to indicated it has a mass 500 times more than that previously calculated by Edwin Hubble. Furthermore, this extra mass seemed to be completely invisible. Although Zwicky’s observations were initially met with much skepticism, they were later confirmed by other groups of astronomers.
    Thirty years later, astronomer Vera Rubin provided a huge piece of evidence for the existence of dark matter. She discovered that the centers of galaxies rotate at the same speed as their extremities, whereas, of course, they should rotate faster. Think of a vinyl LP on a record deck: its center rotates faster than its edge. That’s what logic dictates we should see in galaxies too. But we do not. The only way to explain this is if the whole galaxy is only the center of some much larger structure, as if it is only the label on the LP so to speak, causing the galaxy to have a consistent rotation speed from center to edge.
    Vera Rubin, following Zwicky, postulated that the missing structure in galaxies is dark matter. Her ideas were met with much resistance from the astronomical community, but her observations have been confirmed and are seen today as pivotal proof of the existence of dark matter.

    Astronomer Vera Rubin at the Lowell Observatory in 1965, worked on Dark Matter (The Carnegie Institution for Science).


    Vera Rubin measuring spectra, worked on Dark Matter (Emilio Segre Visual Archives AIP SPL).


    Vera Rubin, with Department of Terrestrial Magnetism (DTM) image tube spectrograph attached to the Kitt Peak 84-inch telescope, 1970. https://home.dtm.ciw.edu.


    _____________________________________________________________________________________

    See the full article here .

    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    ETH Zurich campus
    Swiss Federal Institute of Technology in Zürich [ETH Zürich] [Eidgenössische Technische Hochschule Zürich](CH) is a public research university in the city of Zürich, Switzerland. Founded by the Swiss Federal Government in 1854 with the stated mission to educate engineers and scientists, the school focuses exclusively on science, technology, engineering and mathematics. Like its sister institution Swiss Federal Institute of Technology in Lausanne [EPFL-École Polytechnique Fédérale de Lausanne](CH) , it is part of the Swiss Federal Institutes of Technology Domain (ETH Domain)) , part of the Swiss Federal Department of Economic Affairs, Education and Research.

    The university is an attractive destination for international students thanks to low tuition fees of 809 CHF per semester, PhD and graduate salaries that are amongst the world’s highest, and a world-class reputation in academia and industry. There are currently 22,200 students from over 120 countries, of which 4,180 are pursuing doctoral degrees. In the 2021 edition of the QS World University Rankings ETH Zürich is ranked 6th in the world and 8th by the Times Higher Education World Rankings 2020. In the 2020 QS World University Rankings by subject it is ranked 4th in the world for engineering and technology (2nd in Europe) and 1st for earth & marine science.

    As of November 2019, 21 Nobel laureates, 2 Fields Medalists, 2 Pritzker Prize winners, and 1 Turing Award winner have been affiliated with the Institute, including Albert Einstein. Other notable alumni include John von Neumann and Santiago Calatrava. It is a founding member of the IDEA League and the International Alliance of Research Universities (IARU) and a member of the CESAER network.

    ETH Zürich was founded on 7 February 1854 by the Swiss Confederation and began giving its first lectures on 16 October 1855 as a polytechnic institute (eidgenössische polytechnische Schule) at various sites throughout the city of Zurich. It was initially composed of six faculties: architecture, civil engineering, mechanical engineering, chemistry, forestry, and an integrated department for the fields of mathematics, natural sciences, literature, and social and political sciences.

    It is locally still known as Polytechnikum, or simply as Poly, derived from the original name eidgenössische polytechnische Schule, which translates to “federal polytechnic school”.

    ETH Zürich is a federal institute (i.e., under direct administration by the Swiss government), whereas the University of Zürich is a cantonal institution. The decision for a new federal university was heavily disputed at the time; the liberals pressed for a “federal university”, while the conservative forces wanted all universities to remain under cantonal control, worried that the liberals would gain more political power than they already had. In the beginning, both universities were co-located in the buildings of the University of Zürich.

    From 1905 to 1908, under the presidency of Jérôme Franel, the course program of ETH Zürich was restructured to that of a real university and ETH Zürich was granted the right to award doctorates. In 1909 the first doctorates were awarded. In 1911, it was given its current name, Eidgenössische Technische Hochschule. In 1924, another reorganization structured the university in 12 departments. However, it now has 16 departments.

    ETH Zürich, EPFL (Swiss Federal Institute of Technology in Lausanne) [École polytechnique fédérale de Lausanne](CH), and four associated research institutes form the “ETH Domain” with the aim of collaborating on scientific projects.

    Reputation and ranking

    ETH Zürich is ranked among the top universities in the world. Typically, popular rankings place the institution as the best university in continental Europe and ETH Zürich is consistently ranked among the top 1-5 universities in Europe, and among the top 3-10 best universities of the world.

    Historically, ETH Zürich has achieved its reputation particularly in the fields of chemistry, mathematics and physics. There are 32 Nobel laureates who are associated with ETH Zürich, the most recent of whom is Richard F. Heck, awarded the Nobel Prize in chemistry in 2010. Albert Einstein is perhaps its most famous alumnus.

    In 2018, the QS World University Rankings placed ETH Zürich at 7th overall in the world. In 2015, ETH Zürich was ranked 5th in the world in Engineering, Science and Technology, just behind the Massachusetts Institute of Technology(US), Stanford University(US) and University of Cambridge(UK). In 2015, ETH Zürich also ranked 6th in the world in Natural Sciences, and in 2016 ranked 1st in the world for Earth & Marine Sciences for the second consecutive year.

    In 2016, Times Higher Education WorldUniversity Rankings ranked ETH Zürich 9th overall in the world and 8th in the world in the field of Engineering & Technology, just behind the Massachusetts Institute of Technology(US), Stanford University(US), California Institute of Technology(US), Princeton University(US), University of Cambridge(UK), Imperial College London(UK) and

     
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