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Probing the Dark Universe - A Lecture by Dr. Josh Frieman

  • Probing the Dark Universe - A Lecture by Dr. Josh Frieman


    In this one-hour public lecture Josh Frieman, director of the Dark Energy Survey, presents an overview of our current knowledge of the universe and describe new experiments and observatories. Over the last two decades cosmologists have made remarkable discoveries: Only 4 percent of our universe is made of ordinary matter - atoms, molecules, etc. The other 96 percent is dark, in forms unlike anything with which we are familiar. About 25 percent is dark matter, which holds galaxies and larger-scale structures together and may be a new elementary particle. And 70 percent is thought to be dark energy, an even more mysterious entity which speeds up the expansion of the universe. Josh Frieman is senior staff scientist at the Fermilab and Professor of Astronomy and Astrophysics and member of the Kavli Institute for Cosmological Physics at the University of Chicago. The Dark Energy Survey is a collaboration of 300 scientists from 25 institutions on 3 continents, which built and uses a powerful 570-Megapixel camera on a telescope in Chile to carry out a 5-year survey of 300 million galaxies and thousands of supernovae to probe dark energy and the origin of cosmic acceleration.

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  • Probing the Dark Universe - Professor Josh Frieman - Cornell University Lecture - 4- 26- 17


    Free Lecture at Cornell University....learning about the mysterious Universe...mostly , non-material or physical....

    Only 4 percent of our universe is made of ordinary matter like atoms and molecules. The other 96 percent is in entirely unfamiliar forms we know almost nothing about. About 25 percent is dark matter, which holds galaxies and larger-scale structures together; another 70 percent is thought to be dark energy, an even more mysterious entity that appears to be driving the accelerated expansion of the universe.

    see article on this:

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  • Probing the Dark Universe A Lecture by Dr Josh Frieman YouTube wav


  • Josh Frieman - Probing Cosmology with the Dark Energy Survey


    Stanford Physics Applied Physics/Physics colloquium, Tuesday, Nov. 28, 2017

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  • Dark Matter - Lecture 1


    Dark Matter - Lecture 1
    Speaker: Tracy Slatyer (MIT)
    Summer School on Cosmology | (smr 2844)

  • Prof. Josh Frieman of the University of Chicago on the evolution of the universe, expansion


    Scientific Sense ® by Gill Eapen: Prof. Josh Frieman of the University of Chicago on the evolution of the universe, expansion, accelerated expansion, the use, and misuse of the cosmological constant, dark energy, dark matter, the dark energy survey, and what could be in store for cosmology in the coming years.

    Prof. Josh Frieman is Head of the Particle Physics Division at Fermilab, a Department of Energy national laboratory near Chicago that carries out fundamental research in high-energy physics. He is also Professor of Astronomy and Astrophysics in the Kavli Institute for Cosmological Physics at the University of Chicago and is currently President of the Aspen Center for Physics. He is a member of the American Academy of Arts and Sciences, an Honorary Fellow of the Royal Astronomical Society, a Fellow of the American Physical Society and of the American Association for the Advancement of Science.

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  • Lesson 28 - Lecture 3 - Dark Matter - OpenStax


    In this lecture will will discuss dark matter. We will look at how dark matter was discovered and the implications that dark matter has for our universe. These lecture videos are designed to complement the content in the OpenStax Astronomy textbook. The book can be downloaded free of charge at:

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    KICP Colloquium, Josh Frieman (KICP/Fermilab) speaking on: Probing Cosmology with the Dark Energy Survey

  • Public Lecture: Dark Matter in the Universe


    Dr. Katherine Freese will help you expand your knowledge of the cosmic cocktail that makes up the known universe, recounting the hunt for dark matter, and discussing the evidence for the existence of dark matter in galaxies. Many cosmologists believe we may be on the verge of solving this mystery, which will be an epochal discovery in humankind's quest to understand the universe. Explore the mysteries of this universe as APS presents Dr. Katherine Freese and Dark Matter in the Universe.

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  • Unveiling the Dark Universe with the Dark Energy Survey – Dr. Alexandra Amon


    Throughout history, the Universe has had a way of turning our grandest thoughts upside down. Now, we see that the cosmos is dark: dominated by dark matter and dark energy. With the Dark Energy Survey imaging 1/8th of the night sky — and mapping more than 100 million galaxies — we can get a clearer understanding of the vast Universe we call home.

    Our presenter is Dr. Alexandra Amon, postdoctoral researcher and Kavli Fellow at Stanford's Kavli Institute for Particle Astrophysics & Cosmology. This video, produced by Thomas Mittiga, is based on a Zoom event recorded and co-hosted by Wonderfest and by the Mt Tamalpais Astronomy Program on August 14, 2021.

  • Antimatter and other deep mysteries – Public lecture by Dr. Gerald Gabrielse


    Our universe is made of matter. Yet the Big Bang produced essentially equal amounts of matter and antimatter according to our most fundamental understanding of the building blocks of nature. The inability of our fundamental theory to describe this basic feature of our universe is the great frustration of modern physics. In this one-hour lecture, held on Feb. 19, 2021, Dr. Gerald Gabrielse, Northwestern University, gives an introduction to antimatter and matter, explains the theoretical framework that explains particle interactions, and gives examples of attempts to solve the mystery of antimatter.

    Dr. Gerald Gabrielse, a member of the National Academy of Science and the American Academy of the Arts and Sciences, is a Trustees Professor at Northwestern University. His vision, techniques and measurements started low-energy antiproton and antihydrogen research at the European laboratory CERN. He has made the most precise measurement of a property of an elementary particle, the electron’s magnet, to test the Standard Model’s most precise prediction. His test of whether the electron charge is spherical is one of the most sensitive tests for physics beyond the Standard Model.

    For more information about the Fermilab Arts and Lecture Series, please visit:

  • Unveiling the Dark Universe with the Dark Energy Survey – Dr. Alexandra Amon


    Throughout history, the Universe has had a way of turning our grandest thoughts upside down. Now, we see that the cosmos is dark: dominated by dark matter and dark energy. With the Dark Energy Survey imaging 1/8th of the night sky — and mapping more than 100 million galaxies — we can get a clearer understanding of the vast Universe we call home.

    Our presenter is Dr. Alexandra Amon, postdoctoral researcher and Kavli Fellow at Stanford's Kavli Institute for Particle Astrophysics & Cosmology. This video, produced by Thomas Mittiga, is based on a Zoom event recorded and co-hosted by Wonderfest and by the Mt Tamalpais Astronomy Program on August 14, 2021.

  • Neutrinos: Messengers from a Violent Universe


    In this 45-minute presentation Alex Himmel, Wilson Fellow at Fermi National Accelerator Laboratory, explains how neutrinos might provide the answers to many questions that scientists have about the universe. The neutrino is a type of subatomic particle. They are produced in copious quantities by celestial objects -- trillions of neutrinos from the sun will pass through your body while you read this sentence -- but they interact so rarely with other particles that only a handful will strike an atom in your body during your entire life. Yet these benign little particles can tell us about some of the most energetic processes in the universe. In order to detect these elusive particles, scientists build enormous particle detectors deep underground, using tanks full of liquid argon in an old gold mine as well as a cubic kilometer of Antarctic ice. In this talk Himmel works his way from the sun to galactic supernovae to the possible extragalactic sources of the highest-energy neutrinos ever observed. Himmel also answers audience questions from members of the Naperville Astronomical Association.

  • Physics in the Dark: Searching for the Universe’s Missing Matter


    If you believe the world’s leading physicists, the vast majority of matter in the universe is hiding in plain sight. For nearly a century, evidence has mounted that the gravitational pull necessary to keep clusters of galaxies intact, as well as stars within galaxies from flying apart, requires far more matter than we can see—matter, according to the experts, that has eluded our telescopes, because it does not give off light. Problem is, such “dark matter” has also eluded one specially designed detector after another that researchers have deployed to catch it. Which raises the big question: What if we have failed to find dark matter because it isn’t there? Join leading physicists on a scientific treasure hunt that has proved more challenging than anyone expected, and may ultimately require rethinking some of our most fundamental ideas about the universe.

    This program is part of the BIG IDEAS SERIES, made possible with support from the JOHN TEMPLETON FOUNDATION.

    PARTICIPANTS: Mariangela Lisanti, Joseph Silk, Erik Verlinde, and Risa Wechsler

    MODERATOR: Brian Greene

    00:00 - Introduction to dark matter
    10:55 - Panelist introductions
    12:28 - How do we explain motion in the universe?
    16:35 - Is the “dark stuff” ordinary matter?
    22:43 - Supersymmetric particles
    30:06 - Weakly Interacting Massive Particles
    33:14 - Searchng for WIMP dark matter
    37:25 - What is the role of dark matter in the structure of the universe?
    43:23 - Cold vs warm dark matter
    46:54 - The “dark sector” possibility
    52:56 - Expanding our understanding of gravity and thermodynamics
    1:01:34 - Is there a connection between dark energy and dark matter?
    1:07:36 - Why do galaxies rotate?
    1:14:25 - Future predictions for the discovery of dark matter

    - Produced by Laura Dattaro
    - Associate Produced by Peter Goldberg
    - Music provided by APM
    - Additional images and footage provided by: The Dark Energy Survey, SLAC National Accelerator Laboratory
    - Recorded at the Gerald W. Lynch Theatre at John Jay College


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  • Unraveling the mysteries of dark matter with streams of stars - public lecture by Khyati Malhan


    Much like our home planet, our home Galaxy - Milky Way - also hosts several rivers. But these rivers are made of stars, and are known as “streams of stars”. Stellar streams are pristine structures that have been continuously orbiting our Galaxy for billions of years. Recently, they have sparked tremendous amount of interest among the community because of the potential scientific merits they hold for various cosmic studies. The attempt of this lecture is to demonstrate how astrophysicists (like myself) turn such star structures into a tool to probe various cosmic problems, in particular to understand the nature of dark matter.

    A public lecture by Khyati Malhan
    Khyati Malhan is a researcher at the Department of Physics. He is an astrophysicist, working in the domain of Galactic Dynamics and Galactic Archaeology.

  • The Dark Universe - with Adam Riess


    Leading cosmologists Renée Hlozek, Risa Wechsler, Lucie Green and Nobel Prize winner Adam Riess explore our understanding of dark matter and dark energy.

    Watch the Q&A discussion here:
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    We now think the Universe is packed with invisible materials – dark matter and dark energy – pulling and pushing the parts that we see. BBC Stargazing Live and Sky at Night presenter, Lucie Green explores this frontier of understanding with Nobel laureate Adam Riess and leading cosmologists Renée Hlozek and Risa Wechsler.

    Adam Riess is an astrophysicist at Johns Hopkins University and the Space Telescope Science Institute. Riess shared the Nobel Prize in Physics in 2011 for providing evidence that the expansion of the Universe is accelerating. More recently, he has also been awarded the Breakthrough Prize in Fundamental Physics, adding to his many awards and prizes over the years.

    Lucie Green is a space scientist based at UCL’s Department of Space and Climate Physics. She studies the atmosphere of the Sun, particularly the immense magnetic fields which sporadically erupt into the Solar System. She is also actively involved in public engagement with science, regularly giving public talks and presenting TV and radio programmes.

    Risa Wechsler is an astrophysicist and a professor at the Kavli Institute for Particle Astrophysics and Cosmology at Stanford University and the SLAC National Accelerator Laboratory. Wechsler's work combines massive cosmological simulations with large galaxy surveys that are mapping the Universe, to study the nature of dark energy, dark matter, and the formation of galaxies. She is currently leading the science collaboration of the Dark Energy Spectroscopic Instrument, which will make a 3D map of 30 million galaxies to elucidate the structure of the Universe.

    Dr. Renée Hlozek is the Lyman Spitzer Jr. Postdoctoral Fellow in Theoretical Astrophysics in at Princeton University; the Spitzer-Cotsen Fellow in the Princeton Society of Fellows in the Liberal Arts and is currently a Senior TED Fellow. In 2011, she received her DPhil in Astrophysics from Oxford University as a Rhodes Scholar from the class of South-Africa-at-Large and Christ Church, 2008. Her research focuses on theoretical cosmology; as a member of the Atacama Cosmology Telescope she measures the Cosmic Microwave Background radiation to decipher the initial conditions of the universe.

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  • Next in Science | Astronomy and Astrophysics | Part 1 || Radcliffe Institute


    In 2015–2016, the Next in Science series focused on frontiers in astronomy and astrophysics. Scholars discussed new interdisciplinary research on what the structure of the universe tells us about particle interactions, gravitational waves from circling black holes, magnetic fields in intergalactic space, and the possibility of life on exoplanets.

    “Deciphering the Early Universe: Connecting Theory with Observations” (6:15)
    Cora Dvorkin, Shutzer Assistant Professor, Radcliffe Institute, and assistant professor of physics, Faculty of Arts and Sciences, Harvard University

    “Everything You Always Wanted to Know about Gravitational Waves*
    *But Were Afraid to Ask” (39:52)
    Salvatore Vitale, research scientist, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology

    Introductions by John Huth, faculty codirector of the science program, Radcliffe Institute, and Donner Professor of Science, Faculty of Arts and Sciences, Harvard University

    The Next in Science series provides an opportunity for early-career scientists whose innovative, cross-disciplinary research is thematically linked to introduce their work to one another, to fellow scientists, and to nonspecialists from Harvard and the greater Boston area.

  • Sinziana Paduroiu - The Dark Universe: Dark Matter Models in Theory, Simulations and Observations


    A review of dark matter theoretical models and their challenges, Astrophysicist and Cosmologist Sinziana Paduroiu's talk covers several particle candidates, with a focus on numerical simulations of various dark matter models - warm dark matter in particular - while giving hints for possible observational tests to constrain these models. SINZIANA'S SIMULATIONS MOVIE PLAYLIST:

    Sinziana Paduroiu has a PhD in Astrophysics and Cosmology from the University of Geneva. Her work focuses on numerical simulations of dark matter models.

    CLICK HERE FOR SINZIANA PADUROIU'S kindle edition: 'The Dark Side Of The Universe' which introduces the notions of dark matter and dark energy with several observational pieces of evidence that led the scientific community on a quest to deeply explore uncharted territories, both in the realm of physical space exploration and in the realm of theoretical possibilities. Several models are discussed in this book for the general public.










  • Lisa Randall on Dark Matter and the Dinosaurs | JCCSF


    Harvard professor Lisa Randall (Warped Passages, Knocking on Heaven’s Door) is among our most influential theoretical physicists. Her new book, Dark Matter and the Dinosaurs, explores the consequences of the comet responsible for the dinosaurs’ extinction, speculates about other possible missing elements and illustrates the importance of preserving the elements on Earth that are vital to our existence.

    To learn more about JCCSF, visit us at

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    #LisaRandall #Harvard #Physicist

  • How Cosmology Grew, 1916 to 2016 Sackler Lecture


    Speaker: James Peebles (Princeton University)
    Host: Charles Alcock

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  • 40 Years Voyager - 2017 NASA Science Lecture


    In 1977, NASA's twin Voyager spacecraft embarked on an incredible journey to the outer planets and beyond. After delivering stunning images of Jupiter, Saturn, Uranus and Neptune, the probes sailed on to study the boundary of our heliosphere, the bubble that encompasses our sun, planets and solar wind. Voyager 1 crossed that frontier in August 2012, becoming the first human-made object in interstellar space, while Voyager 2 is expected to enter the space between the stars in the coming years. This live public talk at NASA's Jet Propulsion Laboratory in Pasadena, California, revisits highlights of the last 40 years and discuss what may lie ahead for the intrepid Voyagers.

    Speaker: Alan Cummings, Senior Research Scientist at Caltech and Voyager team member since 1973

    Credit: NASA JPL

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    #DeepSpaceTV #Voyager #ScienceLecture

  • Innovation Speaker Series - Sean Carroll - 7/6/17


    Sean Carroll, Research Professor of Physics, Caltech

    From Sean Carroll:

    I'm a theoretical physicist at Caltech in sunny Pasadena, California. I do research on theoretical aspects of cosmology, field theory, gravitation, and quantum mechanics. I want to learn about fundamental physics by studying the structure and evolution of the universe.

    These days I'm especially interested in inflation, the arrow of time, and how quantum mechanics intersects with cosmology. I've done work on dark matter and dark energy, modified gravity, topological defects, extra dimensions, and violations of fundamental symmetries. See my research page for more details.

    I've written a couple of popular-level books: From Eternity to Here: The Quest for the Ultimate Theory of Time, and The Particle at the End of the Universe: How the Hunt for the Higgs Boson Leads Us to the Edge of a New World. I also wrote a graduate textbook, Spacetime and Geometry: An Introduction to General Relativity, and recorded lectures for the Teaching Company on Dark Matter and Dark Energy and the Mysteries of Time.

    I started blogging back in 2004, and keep it up to this day.

    Summer App Space is a summer apprenticeship for 15 LA students and teachers to learn programming while getting paid to do real world space-related projects.

    Learn more:



    Dr. David Mannion gives another fascinating talk, this time about the search for Dark Matter and Dark Energy at Dr. Becky Parker's initiated Starcentre at Simon Langton Grammar School for Boys, Canterbury, Kent, England.

    He starts by charting the history of last 100 years of Astronomy and the advances in scientific knowledge leading up to the current search for dark matter and dark energy, and how elusive the nature of it still seems to be. Nobel prizes await for the one who reveals the true nature of it all.

    The talk was given on 1st November 2013.

  • Leonard Susskind - How does Dark Energy Drive the Universe?


    Dark energy, the repulsive energy of empty space, was one of the most unexpected and astonishing discoveries in recent science. Most scientists had expected that the expansion of the universe would be slowing down due to the inward pull of gravity. In fact, the expansion of the universe is speeding up, revealing the presence of dark energy. What does it mean?

    Free access to Closer to Truth's library of 5,000 videos:

    Watch more interviews on where dark energy comes from:

    Leonard Susskind is the Felix Bloch Professor of Theoretical Physics at Stanford University, and Director of the Stanford Institute for Theoretical Physics. He received a BS in physics from City College of New York and a PhD from Cornell University.

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    Closer to Truth presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.

  • Full Science Documentary Dark Energy The Biggest Mystery in the Universe Science Documentary


    Science Documentary 2016,BBC ,Science ,Documentary,BBC Science Documentary,Space Documentary,The Space Documentary,Science Documentary,

  • Cameron Smith Public Lecture: Interstellar Voyaging -- An Evolutionary Transition


    Dr. Cameron Smith (Portland State University) delivers the third lecture of the 2014/15 Perimeter Institute Public Lecture Series, in Waterloo, Ontario, Canada. Held at Perimeter Institute and webcast live worldwide on Dec 3., 2014, Smith's lecture explores the biological and cultural challenges associated with multigenerational interstellar space travel.

    Perimeter Institute (charitable registration number 88981 4323 RR0001) is the world's largest independent research hub devoted to theoretical physics, created to foster breakthroughs in the fundamental understanding of our universe, from the smallest particles to the entire cosmos. The Perimeter Institute Public Lecture Series is made possible in part by the support of donors like you. Be part of the equation:

    Subscribe for updates on future live webcasts, events, free posters, and more:

  • Bunyan Lecture 1993 - Carl Sagan


    VHS tape from 1993; cuts off suddenly at 2 hrs, 3min.

  • The Monster Black Hole at the Center of the Milky Way


    Jan. 25, 2017
    Dr. Andrea Ghez (University of California, Los Angeles)
    By measuring the rapid orbits of the stars near the center of our galaxy, Dr. Ghez and her colleagues have moved the case for a supermassive black hole at the heart of the Milky Way from a possibility to a certainty. She reports on her pioneering observations and discusses some of the surprising results this work has led to.

  • 2020 Endowed Chair Lecture Series: Katie Freese


  • The Dark Side of The Universe | What is The Dark Matter and How It Works


    Dear viewers! This is an old documentary but one of the best in its kind. If you are interested in dark matter, this documentary probably explained in a very easy understanding way. If you don't like low-quality graphics, you may skip this video. Thank you for your understanding!

  • Frank Wilczek - Ford/MIT Nobel Laureate Lecture Series 2005 - The Universe is a Strange Place


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  • 2015 Oppenheimer Lecture: Universe or Multi-verse by Andrei Linde


    Cosmological observations show that the universe is very uniform on the maximally large scale accessible to our telescopes. The best theoretical explanation of this uniformity is provided by the inflationary theory. Andre Linde will briefly describe the status of this theory in view of recent observational data obtained by the Planck satellite. Rather paradoxically, this theory predicts that on a very large scale, much greater than what we can see now, the world may look totally different. Instead of being a single spherically symmetric balloon, our universe may look like a multiverse,” a collection of many different exponentially large balloons (univ-erses) with different laws of low-energy physics operating in each of them. The new cosmological paradigm, supported by developments in string theory, changes the standard views on the origin and the global structure of the universe and on our own place in the world.

  • Henk Hoekstra: Weak Lensing by large-scale structure as an accurate probe of cosmology


    Henk Hoekstra (Leiden University)

    Weak Lensing by large-scale structure as an accurate probe of cosmology and much more!

    Weak lensing by large-scale structure is one of the most promising techniques to learn more about the nature of dark energy by mapping the dark matter distribution in the Universe as a function of distance. Weak lensing has also developed into the main tool to determine cluster masses, critical for their use for cosmology, but can also be used to study the dark matter halos of galaxies.I will review the recent progress in this active area of research and discuss the prospects for future projects, such as Euclid.

  • Lecture 24 - Dark Matter


    watch before class on Wednesday, April 30 and post a question in the comments.
    Lecturer: Maria

  • “Faster, Smaller, Cheaper: Discovering the Universe on a Shoestring Budget,Jonathan Feng, UC Irvine


    The elements of the periodic table make up only 5% of the universe. What makes up the other 95% is one of the greatest mysteries in science today. For decades, the leading attempts to find the answers have been large undertakings, requiring billions of dollars, thousands of physicists, and decades of effort. More recently, however, new ideas have led to novel opportunities to probe the universe with relatively fast, small, and cheap experiments. In this talk, Jonathan Feng will explain how this new approach came to be, give some prominent examples, and speculate about what a discovery could mean for our understanding of the cosmos.

  • KIPAC@10: Shedding Light on the Dark Side of the Universe


    From Plato's claim that the world is made up of earth, water, air, and fire, to the discovery in the past century of protons, neutrons, quarks and ever more exotic particles, humans have made a lot of progress in figuring out what their world is made of. It may seem shocking, then, that in the past 15 years or so, scientists have realized that the stuff making up all the atoms in all the galaxies, stars, planets, and humans we've ever observed only constitutes ~5% of the Universe. While we might be close to pinning down the nature of part (~27%) of the missing stuff (see dark matter interview), the nature of the dominant (~68%) component of the Universe, called dark energy, is still incredibly elusive. In this video KIPAC's Josh Meyers interviews Fermilab's Josh Frieman, head of the Dark Energy Survey and also a professor at the University of Chicago, about what he hopes the coming years hold for dark energy research.

    To read Josh's blog post and watch the full conference session, visit:

    For more blogs from KIPAC@10: Big Questions in Particle Astrophysics and Cosmology, visit:

  • The Search for Axion Dark Matter



    Ben Safdi
    U. Michigan
    Ron Walsworth

    Dark matter is the dominant source of matter in our Universe. However, while dark matter dictates the evolution of large-scale astrophysical systems through its gravitational effects, the particle nature of dark matter is unknown. This is despite the significant effort that has gone into the search for particle dark matter over the past decades. In this talk I will review the current status of the search for particle dark matter. I will focus specifically on a dark matter particle candidate called the axion, which is both well-motivated theoretically and also relatively unexplored experimentally. I will outline the near-term program for searching for axion dark matter and show that if this theory is correct, then we will probably know soon.

  • George Darwin Lecture 2020, Ofer Lahav


  • Galactic mega-cities: a short story on galaxy clusters Public Lecture Series


    Astronomer Dr Catrina Diener talks about galaxy clusters.

  • Neal Weiner : Dark Matter Model Building - Lecture 1


  • Public Lecture | Galaxy Clusters and the Life and Death of the Universe


    The distribution of galaxies in the universe is patchy. Galaxies are bound together in clusters made of stars, hot gas and invisible dark matter. These galaxy clusters are part of a cosmic web of filaments, nodes and empty voids that has been building up over 13 billion years. How do we observe this structure, and how do we use gravitational lensing and satellite X-ray observations to measure its mass? How do galaxy clusters trace the past expansion of the universe and reveal our future? This lecture highlights data from the Dark Energy Survey, today’s largest cosmic survey, to answer these questions.

    About the speaker:

    SLAC Research Scientist Eli Rykoff has been weighing the universe for over a decade. He received his PhD from the University of Michigan in 2005, where he built a worldwide network of automated telescopes for following gamma-ray bursts, the most energetic explosions in the universe. After graduating, he transitioned to studying galaxy clusters, which evolve over billions of years rather than fractions of seconds, and did postdoctoral research at the University of California, Santa Barbara and Lawrence Berkeley National Laboratory. Rykoff moved to SLAC in 2012, where he works on galaxy cluster finding and other studies for the Dark Energy Survey and the upcoming Large Synoptic Survey Telescope. He also develops educational astronomy apps for the iPhone and iPad, including CosmoCalc, a full-featured cosmological calculator, and GravLens3, a gravitational lens simulator.

  • LSST DE SChool, February 2015: Shirley Ho - LSSTs Cosmological Probes


    Shirley Ho- Cosmological Pulses

  • Probing the Large Scale Universe


    Science for the Public Jan 19, 2016
    Licia Verde, Ph.D. ICREA Professor of Physics, Instituto de Ciencias del Cosmos (ICC), Universidad de Barcelona (Spain); Radcliffe Fellow (2015-2016)
    Dr. Verde discusses the large-scale universe and scientists' effort to understand dark matter, dark energy, and the acceleration of the expanding universe. She explains how sky surveys track the acceleration, and also the how scientists are searching for the unknown source(s) of dark matter and dark energy.

  • Shining Light on the Dark Side of the Universe - Fall 2014 Compton Lectures


    Lecture 7: The Indirect Detection of Dark Matter with Gamma Rays by Tim Linden

    Thanks to Roy Lipscomb for recording

  • Dark Matter - Lecture 2


    Speaker: F. D'Eramo (Padua University)
    Summer School on Cosmology 2018 | (smr 3213)

  • Shining Light on the Dark Side of the Universe - Fall 2014 Compton Lectures


    Lecture 3: Dark Energy: An Experimental Perspective by Keith Bechtol

    Thanks to Roy Lipscomb for recording.

  • UW Frontiers of Physics Lecture: Dr. Rainer Weiss, Fall 2016


    Dr. Rainer Weiss, emeritus professor of Physics from MIT, speaks to the University of Washington community on Gravitational Wave Astronomy: A New Way. Recorded: October 25, 2016

    Learn more about Dr. Weiss and the Frontiers of Physics Lecture Series here:

  • KIPAC Public Lecture: Jo Dunkley “Our Universe”


  • Seminar: A new measurement of the expansion rate of the Universe and a path to 1 % with Gaia


    Presentation by Nobel Laureate Dr Adam Riess from Johns Hopkins University & STScI, recorded during the first Gaia data workshop at ESA's European Space Astronomy Centre (ESAC) 2-4 November 2016.

    Adam Riess is a U.S. astrophysicist and Bloomberg Distinguished Professor at Johns Hopkins University and the Space Telescope Science Institute and is known for his research in using supernovae as cosmological probes. Riess shared both the 2006 Shaw Prize in Astronomy and the 2011 Nobel Prize in Physics with Saul Perlmutter and Brian P. Schmidt for providing evidence that the expansion of the Universe is accelerating. [Biography source: Wikipedia - Retrieved 31 March 2017 from

    The slides to this presentation are available here:

  • The Blackett Colloquium: Dark Matter


    The Blackett Colloquium is an opportunity to hear about the work being undertaken by Imperial scientists in the Department of Physics.

    Dark matter is one of the biggest mysteries in the whole of physics. Astrophysical observations and theoretical ideas convincingly point to the existence of a new type of particle. This particle makes up a quarter of the contents of the universe, equivalent to five times more than normal matter, yet the dark matter particle has eluded direct observation - thus far.

    Presentations will come from:

    Dr Roberto Trotta (Senior Lecturer in Astrophysics, author of 'The Edge of the Sky')
    Dr Henrique Araujo (experimental astroparticle physicist with the High Energy Physics group)
    Dr Sarah Malik (researcher attached to the Large Hadron Collider Physics Centre)
    Professor Tom Welton (Dean of the Faculty of Natural Sciences) Professor Jordan Nash (Head of Department of Physics).



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