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

  • Dark Energy and the Runaway Universe, Dr. Alex Filippenko, UC Berkeley

    1:49:41

    Are the slight quantum fluctuations of energy levels of electrons in an atom evidence of dark-energy-radiation?
    Observations of very distant exploding stars show that the expansion of the Universe is now speeding up, rather than slowing down due to gravity as expected. Over the largest distances, our Universe seems to be dominated by a mysterious, repulsive dark energy that stretches the very fabric of space itself faster and faster with time.
    November 2nd, 2010

  • Black Holes, Exploding Stars, and the Runaway Universe: A Life in Science

    1:34:58

    January 23, 2019
    Dr. Alex Filippenko (University of California, Berkeley) reviews his fascinating research career in astronomy, focusing on his work with black holes and with active galaxies and supernovae (exploding stars) -- and their role in helping us determine the ultimate fate of the universe. He also talks about some of the circumstances and people that influenced his work as a scientist, about the importance of education and outreach for the public support of science, and about his work to help ensure the future of Lick Observatory, the first permanently occupied mountain-top observatory in the world.

  • Dark Energy and the Runaway Universe | Alex Filippenko | Talks at Google

    1:17:17

    We expected the attractive force of gravity to slow down the rate at which the Universe is expanding. But observations of very distant exploding stars (supernovae) show that the expansion rate is actually speeding up, a remarkable discovery that was honored with the 2011 Nobel Prize in Physics to the teams' leaders. Over the largest distances, the Universe seems to be dominated by a repulsive dark energy -- an idea Albert Einstein had suggested in 1917 but renounced in 1929 as his biggest blunder. It stretches space itself faster and faster with time. But the physical origin and nature of dark energy, which makes up about 70% of the contents of the Universe, is probably the most important unsolved problem in all of physics; it may provide clues to a unified quantum theory of gravity.

    About the Speaker: Alex Filippenko is the Richard & Rhoda Goldman Distinguished Professor in the Physical Sciences. His accomplishments, documented in about 700 research papers, have been recognized by several major prizes, and he is one of the world's most highly cited astronomers. In 2009 he was elected to the National Academy of Sciences, and he shared part of the Gruber Cosmology Prize in 2007. He has won the top teaching awards at UC Berkeley and has been voted the Best Professor on campus a record 9 times. In 2006 he was selected as the Carnegie/CASE National Professor of the Year among doctoral institutions, and in 2010 he won the ASP's Emmons Award for undergraduate teaching. He has produced five astronomy video courses with The Great Courses, coauthored an award-winning textbook, and appears in numerous TV documentaries including about 40 episodes of The Universe series. An avid tennis player, hiker, and skier, he enjoys world travel and is addicted to observing total solar eclipses (11 so far).

  • Purpose and the Universe : Sean M. Carroll

    1:12:14

    For HD slides -


    Here’s another talk by Sean Carroll back in 2013. In this presentation, Sean Carroll discuses how universe works and how it is related to philosophy. In particular, he discusses of whether is possible to find a purpose of existence by studying the principles of physics. Along the day, Carroll briefly discusses the views of the philosophers and scientists from the past. Finally, the talk is concluded by arguing that purposes can be created even if they do not come from fundamental physics.

    Some other useful videos -




    Some other useful articles -





  • Sackler Astronomy Lecture: The Search for Planet Nine

    1:16:45

    Recent evidence suggests that a massive body is lurking at the outskirts of our solar system, far beyond the orbits of the known giant planets. This object, at a distance approximately 20 times further than Neptune and with a mass approximately 5000 times larger than Pluto, is the real ninth planet of the solar system. In his lecture, Mike Brown talks about the observation that led his team to the evidence for this Planet Nine and discusses how so massive an object could have been hiding in the outer solar system for so long. He also discusses the international effort to pinpoint this newest member of our planetary family.

    Mike Brown is the Richard and Barbara Rosenberg Professor of Planetary Astronomy at the California Institute of Technology, specializing in the discovery and study of bodies at the edge of the solar system. He is best known for his discovery of Eris, the most massive object found in the solar system in 150 years, which led to the debate and eventual demotion of Pluto from a real planet to a dwarf planet. In 2006 he was named one of Time Magazine's 100 Most Influential People and was inducted into the National Academy of Sciences in 2014.

  • Planet Nine from Outer Space - K. Batygin - 12/7/2016

    57:02

    Planet Nine from Outer Space - Konstantin Batygin, Assistant Professor of Planetary Science, Caltech

    Learn more about:
    - Konstantin Batygin's research:
    - 2016 - 17 Watson Lecture Series Season:
    - This Lecture:

    Produced in association with Caltech Academic Media Technologies. ©2016 California Institute of Technology

  • Lawrence Krauss CERN Cosmology Lecture - Inflation to Eternity

    1:10:01

    Lecture given by Professor Lawrence M. Krauss at the CERN Colloquium on Cosmological Physics.
    The last decade or two have represented the golden age of observational cosmology, producing a revolution in our picture of the Universe on its largest scales, and perhaps also its smallest ones. In this lecture, Prof. Krauss will argue that these recent development bring to the forefront some vexing questions about whether various fundamental assumptions about the universe are in fact falsifiable. In this he will focus on 3 issues: (1) Proving Inflation, (2) Dark Energy and Anthropic Arguments, and (3) Cosmology of the far future.

    In 2014, the potential smoking gun for inflation was thought to have been found with the following experimental techniques Super-sensitive, superconducting microwave detectors, built at NIST, and implemented at BICEP and Keck telescope arrays at the South Pole have allowed astrophysicists to find out some of the answers with new observational results.

    The Background Imaging of Cosmic Extragalactic Polarization (BICEP) results are indirect evidence for the existence of the elusive gravitational waves from the big bang itself.

    By using highly sensitive microwave detectors, developed at the National Institute of Standards and Technology (NIST), telescope cameras can detect the polarization direction of photons emitted from the moment of last scattering between the photons and electrons in the plasma of the early universe, before stars and galaxies could form.

    These photons make up the CMB Radiation, which radiated outward after electromagnetic radiation decoupled itself from the plasma state of matter in the early universe, as the plasma formed into a gas, making space transparent for the first time. The photons emitted at the moment of last scattering, 13.7 Billion years ago, were gamma ray photons. Since then, they have been travelling almost uniformly, in every direction across the universe. Since the universe is expanding, these photons have stretched with the fabric of spacetime as the universe expanded and this has stretched their wavelength from gamma rays to microwaves.

    The apparently uniform pattern of polarization in the CMB can be broken into two components.
    One, a curl-free, gradient-only component, the E-mode (named in analogy to electrostatic fields).
    The second component is divergence-free, curl only, and is known as the B-mode (named in analogy to magnetic fields).

    Cosmologists predict two types of B-modes, the first generated during cosmic inflation shortly after the big bang, and the second generated by gravitational lensing at later times.
    Now, the BICEP team has confirmed detection of the first type of B-modes, consistent with inflation and gravitational waves in the early universe

    However, there are now grave doubts over the validity of the results. The BICEP2 team underestimated how much dust in our own galaxy can polarize microwave radiation, which was tested with ESA's Planck Mission that observed these effects and compensated for them. In order to salvage any hope of a discovery claim they will have to take more data from BICEP2 and Planck, compensate for the effects of space dust, and then publish the paper before making any announcement as it is a big claim to make, to be sure whether they had in fact seen the first signs of gravitational waves from the Big Bang, or were fooled by the effects of intergalactic space dust. Either way the results were announced too early and without proper scrutiny. The results may yet be salvaged when the results are compensated for the intergalactic dust or they may have to go back to the drawing board and wait for a new series of experiments, including an orbiting satellite for observing B-mode polarization from the CMB. Either way, we are making progress as we now have a real opportunity to answer observational questions that would not have even been asked a decade ago.

  • Cosmic connections: the Universe and You with Lawrence Krauss

    1:5:26

    Lecture brought to you by Science & Cocktails together with ECSJ2017/Danske Videnskabsjournalister/EUSJA.
    Find more about Science and Cocktails, and awesome science talks at
    You are intimately connected to the Universe in ways you might never have imagined. Every atom in your body was once inside other stars that exploded so that you could be here today. How did the universe begin? How will it end? Why are we here in a big rock called Earth travelling through space and time?

    Science & Cocktails, together with the Danish Association of Science Journalists, has the pleasure to invite you to a brilliant evening with theoretical physicist Lawrence Krauss at the Grey Hall in Christiania. In an event integrated in the 4th European Conference for Science Journalists, Lawrence Krauss, the acclaimed author of A Universe from Nothing, will be telling the greatest story ever told about the universe. An evening mixed with some of the finest cocktail mixology, light installations, live art by Henrik Schutze and music performances by Tromleorkestret feat. ROSYAN on cello and their robotic, fire spitting barrel organ, as well as the funky, steamy and surf jazz by the superstars The Orgelheimers and, last but not least, a piece that will trigger specific electrical impulses in your brain with incredible 2D graphics and algorithmic electronic music by Vectral.

    We may have unexpected connections to life elsewhere in the solar system, and you are also directly connected to almost every being that has ever lived on Earth. And even the most esoteric developments at the forefront of physics, from the Large Hadron Collider, to the discovery of gravitational waves impact on you in ways you might never have anticipated. In this evening, Lawrence Krauss will roam over modern discoveries in science from astronomy to particle physics, and from the remotest corners of the Universe to our own backyard.

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

    1:45:22

    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.

  • Probing the Dark Universe A Lecture by Dr Josh Frieman

    1:45:22

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

    1:22:19

    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:

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

    1:14:02

  • Josh Frieman - Probing Cosmology with the Dark Energy Survey

    1:12:30

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

  • The Dark Universe - with Adam Riess

    37:39

    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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  • Physics | Antimatter and Dark Matter

    2:10:59

    Dark matter is a theorized form of matter that is thought to account for approximately 80% of the matter in the universe, and about a quarter of its total energy density. The majority of dark matter is thought to be non-baryonic in nature, possibly being composed of some as-yet undiscovered subatomic particles. Dark matter has not been directly observed, but its presence is implied in a variety of astrophysical observations, including gravitational effects that cannot be explained unless more matter is present than can be seen. For this reason, most experts think dark matter to be ubiquitous in the universe and to have had a strong influence on its structure and evolution. The name dark matter refers to the fact that it does not appear to interact with observable electromagnetic radiation, such as light, and is thus invisible (or 'dark') to the entire electromagnetic spectrum, making it extremely difficult to detect using usual astronomical equipment.

  • Dark Matter - Lecture 1

    1:19:07

    Speaker: F. D'Eramo (Padua University)
    Summer School on Cosmology 2018 | (smr 3213)
    2018_06_18-11_15-smr3209

  • Lee Smolin Public Lecture Special: Einstein’s Unfinished Revolution

    1:17:57

    On April 17, in a special webcast talk based on his latest book, Einstein’s Unfinished Revolution, Perimeter’s Lee Smolin argued that the problems that have bedeviled quantum physics since its inception are unsolved and unsolvable for the simple reason that the theory is incomplete. There is more to quantum physics waiting to be discovered.

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

  • Marcus Allen: Ancient Technology of the Egyptians FULL LECTURE

    1:3:02

    Join Megalithomania in November 2021 to explore this pyramid and others on a specially designed 13 day tour. Details at In modern times, granite is easily cut and shaped using diamond drills and tungsten-tipped chisels. In Ancient Egypt, 100 ton obelisks and blocks of granite were cut from the bed-rock, and shaped using diorite pounding balls, copper tools and sand. This is the accepted consensus. But these crude methods are so unlikely to have produced the visible results as to be, at best, simply a guess. The elegant and sophisticated artifacts seen across Egypt from Giza to Luxor to Aswan and displayed in the great museums of the world, are testament to whatever technique was used in their creation.
    Today, this technology is a mystery to us. Stylised human/animal statues carved from granite, intricate hieroglyphs cut into granite obelisks and perfectly flat blocks of granite are some of the proof for this technology. The rain forests of South America might be the place to start looking for answers. In his illustrated presentation, Marcus will show evidence indicating the skills seemingly in use over 4,000 years ago. These results would be virtually impossible to replicate today, using the tools we are told were available in Ancient Egypt. But is the evidence for the actual technology simply ‘hidden in plain sight’?

    After a career with a major Motor manufacturer, Marcus changed jobs completely and became the UK publisher of NEXUS Magazine, which he and his wife first introduced to this country in 1994. Since then, he has appeared on many TV and radio programmes and given numerous presentations both here and abroad, discussing subjects sometimes considered controversial. These include the Apollo Moon Landings, political conspiracies, and UFOs, as well as promoting NEXUS Magazine.

    Filmed at Weird 11, September 17-18, 2011 Swindon, Wiltshire United Kingdom.

    Copyright Megalithomania/Pentos TV 2011. All Rights Reserved.
    Produced by Hugh Newman -
    Directed by Jonathan Adams -

  • 2018 Reines Lecture: Exploring the Universe with Gravitational Waves by Kip Thorne

    1:20:58

    The 2018 Reines Lecture was presented by Kip Thorne, winner of the 2017 Nobel Prize in Physics for the detection of gravitational waves. The discovery, part of the LIGO experiment, validated Albert Einstein’s longstanding prediction that during cataclysmic events the fabric of spacetime can be stretched, sending gravitational tremors across the universe. Thorne is a graduate of Caltech and Princeton University. His research has focused on Einstein’s general theory of relativity and on astrophysics, and he is co-founder of the LIGO Project. Among his many distinctions, Thorne has been awarded the Albert Einstein Medal, the UNESCO Niels Bohr Gold Medal, the Common Wealth Award for Science, and was named California Scientists of the Year. He was elected to the American Academy of Arts and Sciences, the National Academy of Sciences, and the Russian Academy of Sciences. In addition to his renowned scientific research in theoretical physics, he is involved in writing and movie production. Most notably, he worked on Christopher Nolan’s film Interstellar.

    Exploring the Universe with Gravitational Waves: From the Big Bang to Black Holes

    There are two types of waves that can propagate across the universe: electromagnetic waves and gravitational waves. Galileo initiated electromagnetic astronomy 400 years ago by pointing a telescope at the sky and discovering the moons of Jupiter. LIGO recently initiated gravitational astronomy by observing gravitational waves from colliding black holes. Thorne will describe this discovery, the 50 year effort that led to it, and the rich explorations that lie ahead.

    The Reines Lecture Series honors Frederick Reines, UCI’s Founding Dean of Physical Sciences and co-recipient of the 1995 Nobel Prize for discovering the neutrino.

  • Skywatch Lecture: Dr. Alex Filippenko, Dark Energy and the Runaway Universe

    1:43:34

    Dudley Observatory's Skywatch Lecture for October 19, 2010. Dr. Alex Filippenko of the University of California, Berkeley, lecturing on dark matter and dark energy.

  • Sir Roger Penrose - Einsteins Amazing Theory of Gravity: Black Holes and Novel Ideas in Cosmology

    56:22

    Sir Roger Penrose giving his talk 'Einstein's Amazing Theory of Gravity: Black Holes and Novel Ideas in Cosmology' at 'What's Your Angle?' - a mathematics festival organised in collaboration between the London Mathematical Society and the Science Museum in November 2015
    .

  • The Search for Dark Matter - Professor Carolin Crawford

    1:48

    An introduction to the hunt for dark matter that takes us up to the most current research and theories: Unlike the stars and galaxies, dark matter does not give off any radiation – we can only detect it through its gravitational pull. It accounts for a quarter of the Universe, yet we do not yet understand what it is made of. The search for a better understanding of dark matter is carried out both out in space and deep underground, and where astrophysics meets particle physics.

    The transcript and downloadable versions of the lecture are available from the Gresham College Website: Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,500 lectures free to access or download from the website. Website: Twitter: Facebook:

  • The Accelerating Universe - Professor Joseph Silk

    45:46

    The universe was static, that was the credo of all scientists and philosophers until three decades into the twentieth century, when the expansion was discovered.

    Three quarters of a century later, the notion of a simple expansion of the universe was found to be wrong: the universe is accelerating. One implication is that before 2000, we believed that our successors, billions of years hence would see an ever larger space of galaxies, more numerous than grains of sand on a vast beach. Today with our telescopes we can see billions of galaxies: in the far future there would be, we once believed, uncountable billions to study and even search for signs of life. But with the discovery of accelerating space, our horizon has shrunk immensely. The distant galaxies are racing away from us at ever faster velocities. In a hundred and fifty billion years time, our Milky Way will be the only galaxy left in the observable universe. This lecture will explore the origin of this paradigm shift in our cosmic horizon, and discuss the origin of the acceleration as a phenomenon that we call dark energy.

    The transcript and downloadable versions of the lecture are available from the Gresham College website:

    Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 2,000 lectures free to access or download from the website.

    Website:
    Twitter:
    Facebook:
    Instagram:

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

    42:31

    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.

  • To Infinity and Beyond: The Accelerating Universe

    1:22:23

    Dark energy is cosmology's biggest mystery—an anti-gravitational force that confounds the conventional laws of physics. It makes up more than two-thirds of the cosmos, but science is still grappling to explain what dark energy actually is. In this program, top physicists search for clues to this mystery in both the earliest moments of the universe and far into the future of the cosmos.

    This program is part of the Big Ideas Series, made possible with support from the John Templeton Foundation.

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    Original Program Date: 05/28/2015
    Host: Lawrence Krauss
    PARTICIPANTS: Josh Frieman, Priyamvada Natarajan, Adam Riess, Jan Tauber, Neil Turok

    Lawrence Krauss's introduction. 00:15

    The geometry of space. 4:28

    How to create the clumps from inflation? 8:50

    Einsteins equations. 13:23

    Participant Introductions. 17:50

    What does expansion mean? 20:00

    what have we learned since the cosmological constant? 29:20

    What do the observations show? 37:00

    There is no evidence of gravitational waves. 43:00

    What is the useless useful? 46:04

    Leading the hunt for dark energy. 53:51

    Proving a cosmological constant. 1:02:00

    Will we be able to measure that dark energy as the cosmological constant in this lifetime? 1:07:01

    The history of the universe and forming a black hole. 1:16:59

  • Lisa Randall on Dark Matter and the Dinosaurs

    1:2:30

    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.

    Join the conversation on Twitter: @ArtsJCCSF
    Join the conversation on Facebook: facebook.com/ArtsandIdeasJCCSF/

  • Colloquium, April 28th, 2016 -- Probing the Accelerating Universe with the Dark Energy Survey

    1:12:51

    Josh Frieman

    Probing the Accelerating Universe with the Dark Energy Survey

    The Nobel Prize in Physics for 2011 was awarded for the discovery that the expansion of the Universe is accelerating. Yet the physical origin of cosmic acceleration remains a mystery. The Dark Energy Survey (DES) aims to address the questions: why is the expansion speeding up? Is cosmic acceleration due to dark energy or does it require a modification of General Relativity? If dark energy, is it the energy density of the vacuum (Einstein's cosmological constant) or something else? DES is addressing these questions by measuring the history of cosmic expansion and of the growth of structure through four complementary techniques: galaxy clusters, the large-scale galaxy distribution, weak gravitational lensing, and supernovae. The DES collaboration built a new, 570-megapixel, digital camera for the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory in Chile to carry out a deep, wide-area sky survey of 300 million galaxies and a time-domain survey that will discover several thousand supernovae. I will overview the DES project, which achieved `first light' in September 2012 and which recently completed its third of five survey seasons, and will describe a number of early science results from the solar system to the most distant objects in the Universe.

  • Mapping the Heavens to Understand Dark Matter and Black Holes

    1:29:28

    From time immemorial humans have been charting the night sky to make sense of the cosmos—from the mapping of stars for navigation to today’s digital surveys of galaxies to understand dark matter. In this 60-minute-long presentation Dr. Priya Natarajan, author of the book “Mapping the Heavens,” recounts the evolution of celestial map-making and shows how maps literally track our ever evolving cosmic view. In particular, she discusses recent developments in our understanding of two invisible entities: dark matter and black holes. Dr. Natarajan is a theoretical astrophysicist at Yale University, interested in cosmology, gravitational lensing and black hole physics. Her research focuses on making dark matter maps of clusters of galaxies, the largest known repositories of dark matter.

  • Brian Schmidt - The Accelerating Universe & the hunt for dark energy

    1:1:32

    The Accelerating Universe & the hunt for dark energy: A crazy result that broke our understanding of the nature of the Cosmos

    The 2011 Nobel Laureate for Physics Professor Brian Schmidt explained how astronomers have traced our Universe's history back more than 13 billion years, leading them to ponder the ultimate fate of the Cosmos.

    More information on this event available here:

    Video recorded and produced by Gavin Tapp, ACT Government as part of the Canberra Centenary and Canberra Digital Community Connect project. The Canberra Digital Community Connect project is an Australian Government funded initiative under the Digital Local Government program.

  • Probing Dark Matter, Marek Demiański

    46:06

    The lecture entitled Probing Dark Matter delivered by Marek Demiański on December 7, 2016 in Kraków, Poland.

    There is ongoing search for dark matter particles that would explain observational data as well as models with modified gravity.

  • Dark Energy by Varun Sahni

    1:9:31

    Program

    Cosmology - The Next Decade

    ORGANIZERS : Rishi Khatri, Subha Majumdar and Aseem Paranjape
    DATE : 03 January 2019 to 25 January 2019
    VENUE : Ramanujan Lecture Hall, ICTS Bangalore

    The great observational progress in cosmology has revealed some very intriguing puzzles, the most important of which are the existence of new mysterious components of the Universe: the dark matter and the dark energy. While a standard model of cosmology — the Lambda cold dark matter (LCDM) paradigm — has emerged, many puzzles are as yet unsolved. Is dark energy really just a cosmological constant (Lambda), or is it something dynamical, perhaps even a clue that Einstein’s general relativity needs modifications at cosmological scales? Is dark matter a new particle beyond the Standard Model, and do its microscopic properties leave any imprint at cosmological or galactic scales (e.g., deep inside galaxy clusters, or in dwarf galaxies)? The nature of dark matter would also have very interesting consequences for the reionization history of the Universe, which is already being constrained by observations of high redshift quasars and galaxies and is expected to be determined in considerable detail by upcoming and future 21cm experiments.

    This is therefore a very exciting time in cosmology as we make new proposals for cosmological experiments and wait for the next generation of the already approved experiments to become operational. The nature of data that will be provided by the next generation of cosmological experiments would be overwhelming quantitatively (in the case of large scale structure surveys) and very different from the current data sets qualitatively (in the case of the CMB spectral distortions and polarization and 21 cm experiments). There are also large gaps — mainly driven by astrophysical uncertainties in our theoretical understanding of the large scale structure; these must be filled in order to get the full benefit of these new data sets.

    This is the backdrop against which we plan to have the School and Workshop to explore and discuss these issues as we look forward to another 10 exciting years in cosmology.

    The topics covered in the School will include:

    1. Cosmological perturbation theory and CMB anisotropies
    2. Growth of cosmological LSS and the Cosmic Web
    3. Gravitational lensing
    4. 21cm physics
    5. Galaxy formation and evolution
    6. Galaxy clusters
    7. CMB spectral distortions
    8. Large-scale relativistic effects in the observed LSS
    9. Astro-particle physics, dark matter detection and neutrino cosmology
    10.Cross-correlations between observational probes
    11.Numerical simulations
    12.Gravitational wave physics and cosmology

    The Workshop will bring together a larger number of scientists working in these and related areas for a more advanced discussion of the latest developments in these and related areas.
    In addition, as part of the workshop, there will be one day (a Survey Day) reserved for detailed discussion current and upcoming large scale structure and CMB experiments, especially keeping mind core Indian involvement to specific missions and surveys.

    As part of the program there will be Infosys - ICTS Chandrasekhar Lectures by Prof. Rashid Sunyaev, ICTS Distinguished lectures by Prof. Richard Bond and ICTS Vishveshwara lecture by Prof. Lyman Page.


    CONTACT US: cosmo2019@icts.res.in

    PROGRAM LINK:

  • The Future of Fundamental Physics -- Nima Arkani-Hamed -- Cornell Messenger Lectures

    7:17:30

    The Future of Fundamental Physics
    Nima Arkani-Hamed
    The Messenger Lectures, Cornell University

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    This series is part of Cornell University's Messenger Lectures recorded in October, 2010. The Messenger Lectures are an annual lecture series renowned among physicists and academia in general. Thank you to Cornell University for continuing this proud tradition.

    visit Cornell University's website to find this and other speakers





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    Quantum Mechanics and Space-time 0:00:00
    Standard Models of Particle Physics 1:19:58
    Space-time is Doomed 2:47:04
    Why a Macroscopic Universe? 4:06:04
    What Might We Know by 2020? 5:32:36

    Note: The audio during Standard Models of Particle Physics is of lesser quality than the other lectures due to the source material. So it goes.

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

    1:26:44

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  • 2019 Wriston Lecture: Peter Thiel

    42:44

    Investor and entrepreneur Peter Thiel delivers the 2019 Wriston Lecture.

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  • Kaufmanis Lecture: The Newest Extragalactic Mystery

    1:25:28

    Learn about the new mysterious cosmic phenomenon—Fast Radio Bursts—and the revolutionary new radio telescope that will soon enable astronomers worldwide to make major progress in understanding them. This lecture was presented by the Minnesota Institute for Astrophysics.

  • Listening for Dark Matter with ADMX

    3:07

    The Axion Dark Matter Experiment (ADMX) is on the hunt for theoretical particles called axions, which may solve the dark matter mystery. ADMX, managed by Fermilab and housed at the University of Washington, is the first and only experiment of its type with the sensitivity to detect axion dark matter particles. For more information, please visit and

  • Lisa Randall: Atoms Only Make Up 5% of Our Universe. The Rest is Dark Matter and Energy

    17:04

    Even though it makes up 69 per cent of the Universe, dark energy is incredibly elusive. But theoretical physicist Lisa Randall is determined to track down and understand the unseen parts of our existence.

    ABOUT WIRED LIVE
    Hundreds of leaders from the worlds of technology, art, business and design gathered for WIRED’s two-day festival of innovation. They gathered at London’s Tobacco Dock on November 2-3 2017. Discover some of the fascinating insights from the speakers here:

    ABOUT WIRED EVENTS
    WIRED events shine a spotlight on the innovators, inventors and entrepreneurs who are changing our world for the better. Explore this channel for videos showing on-stage talks, behind-the-scenes action, exclusive interviews and performances from our roster of events. Join us as we uncover the most relevant, up-and-coming trends and meet the people building the future.

    ABOUT WIRED
    WIRED brings you the future as it happens - the people, the trends, the big ideas that will change our lives. An award-winning printed monthly and online publication. WIRED is an agenda-setting magazine offering brain food on a wide range of topics, from science, technology and business to pop-culture and politics.

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  • Richard Dawkins Lecture on Evolution

    1:34:53

    Richard Dawkins Lecture on Evolution

  • Einstein, Black Holes and Cosmic Chirps - A Lecture by Barry Barish

    1:29:02

    Albert Einstein’s theory of general relativity, developed 100 years ago, predicts the existence of gravitational waves. In February 2016, the Laser Interferometer Gravitational-wave Observatory (LIGO) became the first experiment to observe gravitational waves, created by two black holes spiraling into each other. The discovery became known as the chirp heard around the world. Four month later, a few hours before this public lecture, LIGO announced the discovery of a second signal. This lecture, given by Dr. Barry Barish, LIGO director from 1997 to 2006, explains the physics of gravitational waves, the detection technique used by LIGO, the observations made and the implications these discoveries have on our understanding of the cosmos.

  • Dark Energy Probably Doesnt Exist

    9:23

    You can buy Universe Sandbox 2 game here:

    Hello and welcome to What Da Math!
    In this video, we will talk about dark energy and its nonexistence.

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  • Jesse Thaler, MIT, Confronting the Invisible Universe

    1:4:33

    Dark matter is an enigma.  Even though it can be seen through its influence on gravity, dark matter is invisible to the other known forces of nature.  There are numerous ongoing efforts to discover the origin and properties of dark matter, ranging from laboratory experiments to astrophysical investigations.  This intense interest is driven in part by tantalizing hints that the nature of dark matter might be linked to other deep and unsolved mysteries in physics.  In this talk, Professor Thaler presents the overwhelming evidence for dark matter as well as speculates on the broader implications of the invisible universe.

  • Professor Brian Cox Lecture on the universe

    51:29

    A lecture by Brian Cox on how the universe was created.
    If you like this video please help me grow my channel by hitting that like button. Thanks guys! Oh & dont forget all comments are welcome so leave one, or even ask a question & answer a few

  • Defining, Describing, and Detecting Life in the Universe - Cecilia Sanders - 7/10/20

    2:13:35

    The discovery of life elsewhere in the Universe could be the most important scientific discovery in history. Is there life out there? How do we define it? How can we detect it? Join our professional scientists for a lecture and discussion! Start: 00:09; Lecture: 7:35; Expert Q&A Panel: 1:03:55; Fermi Paradox Discussion: 1:31:31

    Date: July 10, 2020
    Lecturer: Cecilia Sanders
    Title: You'll Know It When You See It: Defining, Describing, and Detecting Life in the Universe
    Abstract: When scientists search for life in the universe, what in the world are we looking for? What kinds of fingerprints or signatures do living things leave behind on their non-living surroundings, and what tools do we need to detect them? In this talk, I will attempt to define life, give a brief history of life (as we know it) in the universe, and talk through some of the astro-bio-geo-chemical techniques that we use to study it.

    Speaker & Panelists:

    --Cecilia Sanders is a PhD candidate in geobiology at Caltech, where she studies the geologic record for information about lifeforms on ancient Earth. This is an extension of her previous work as a Masters' student of planetary sciences, when she was intrigued by the preservation problem: how do living things impact the world around them in a way that is preserved in rocks for millions to billions of years? Cecilia tries to answer these questions by measuring and sampling assemblages of ancient, sedimentary rock, and by creating models of the ancient world using living organisms in the laboratory. Her work has taken her to Brazil, Namibia, Turks and Caicos, all over the southwestern United States, and even back home to the fossiliferous cliffs of Maryland/DC. When she isn't doing research, she teaches science to Kindergarten, 1st-, and 2nd-graders in Pasadena Unified Schools and is a community activist for racial justice. She loves to paint, to read fantasy novels, and to run tabletop role playing games for her family and friends. Her favorite foods are passionfruit and doce do leite.

    -- Dr. Andreas Faisst is an assistant scientist at the Infrared Processing and Analysis Center (IPAC) at Caltech. He uses the biggest telescopes in the world to study the growth and structure of the first galaxies in the Universe.

    --Nicole Wallack is a PhD candidate in planetary science at Caltech. She uses space and ground based telescopes to study the atmospheres of planets around other stars to try to understand how planets form and evolve.

    -- Dillon Dong is a PhD candidate in astronomy at Caltech. He uses radio and optical telescopes to study the birth and death of massive stars. In addition to hanging out with his pet bunnies Eloise and Ruben, he has recently been rediscovering his love of bushwhacking and scrambling in the local San Gabriel Mountains.

    --Dr. Cameron Hummels is a postdoctoral researcher in theoretical astrophysics at Caltech. He creates supercomputer simulations to study the formation and evolution of galaxies since the Big Bang.

  • Exploring EUROPA: A Potentially Habitable World - Science Lecture

    1:1:42

    Robert Pappalardo of NASA's Jet Propulsion Laboratory will discuss the upcoming NASA mission to Jupiter's icy moon, Europa, and its potential to support simple life. Jupiter's moon Europa may have an internal ocean of liquid water, along with the chemistry and energy that life requires.

    Credit: University Of Colorado

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  • Barbara Ryden: Introduction to Cosmology - Lecture 2

    1:14:42

    ICTP Summer School on Cosmology 2016
    6 June 2016 - 14:00

  • The Accelerating Universe - Robert P Kirshner

    1:16:40

    Carnegie Observatories 2015 Spring Lecture Series
    A Noise Within Theater, Pasadena, CA, May 11, 2015
    Dr. Robert P. Kirshner, Clowes Professor of Science, Harvard University

    The expanding universe was discovered at Mount Wilson almost 100 years ago. But there is something new! In the past 20 years, astronomers have found that cosmic expansion is speeding up, driven by a mysterious 'dark energy' whose nature we do not understand. Dr. Kirshner, one of today's preeminent astrophysicists, is the recipient of many prestigious awards, including the 2014 Breakthrough Prize in Fundamental Physics (sponsored by Google, among others), as well as the 2014 James Craig Watson Medal of the National Academy of Sciences for 'service to astronomy.'

    Partial funding for Carnegie Observatories' 2015 Astronomy Lecture Series was provided by The Kenneth T. and Eileen L. Norris Foundation. The lectures were hosted by A Noise Within ( Video production of the Lecture Series by Neighbors Video Services (

  • The Epic of Gilgamesh, Lecture by Andrew George

    1:28:46

    Andrew George, Professor of Babylonian, School of Oriental and African Studies (SOAS), University of London

    The Epic of Gilgamesh is a 4,000-year-old Mesopotamian poem about a hero who embarks on an arduous quest to find the secret of immortality. Preserved on clay tablets in cuneiform script, it is generally considered to be the earliest great work of literature to survive from the ancient world. In this illustrated lecture, Andrew George, author of a prize-winning translation of the Epic of Gilgamesh, explores four themes related to this Babylonian masterpiece: the archaeology of the poem’s recovery, the reconstruction of its text, the story it tells, and its messages about life and death.

    Presented in collaboration with the Departments of Near Eastern Languages & Civilizations and Comparative Literature, with the support of the Provostial Fund for the Arts and Humanities, Harvard University

  • Dark side of the Universe - Documentary

    57:23

    Dark side of the Universe - Documentary
    With dark matter, dark energy, phantom matter and even a dark force, physics news can sometimes sound like the voiceover for a superhero movie. So what’s behind all the ominous-sounding jargon?

  • Is Dark Matter Made out of Blackholes? In Universe Sandbox²

    16:03

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    Hello and welcome to What Da Math!

    In this video, we will talk about a hypothesis that Dark Matter may be made out of blackholes, suggesting there are a lot of them out there.

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  • Probing The Distant Universe With Hubble Space Telescope - Part 2

    11:49

    Bullitt Lecture in Astronomy 2019 at the University of Louisville by Dr. Robert Williams, Astronomer Emeritus at the Space Telescope Science Institute. He explores how astronomers have used the Hubble to look back in time to piece together the formation of structure in the universe shortly after the Big Bang, and how small perturbations in the early universe grew to form the giant galaxies that now fill the cosmos. Part 2/9.

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