PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | Cosmological non-Constant Problem Speaker(s): Niayesh Afshordi
Abstract: I will discuss how studying the gravitational effects of UV physics on large (astrophysical) scales precludes new mass scales in BSM physics beyond 600 GeV.
Date: 05/06/2018 - 3:45 pm
Collection: Asymptotic Safety in a Dark Universe
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 | Quantum Black Holes in the Sky: from Quantum Gravity to Astrophysics and Cosmology Speaker(s): Niayesh Afshordi
Abstract: In classical General Relativity (GR), an observer falling into an astrophysical black hole (BH) is not expected to experience anything dramatic as she crosses the event horizon. However, tentative resolutions to problems in quantum gravity, such as the cosmological constant problem or the black hole... read more
Date: 27/02/2018 - 11:00 am
Series: Cosmology & Gravitation
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 | PHYS 781 - Lecture 25 Speaker(s): Niayesh Afshordi
Abstract:
Date: 28/11/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 24 Speaker(s): Niayesh Afshordi
Abstract:
Date: 27/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 23 Speaker(s): Niayesh Afshordi
Abstract:
Date: 25/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 22 Speaker(s): Niayesh Afshordi
Abstract:
Date: 21/11/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 21 Speaker(s): Niayesh Afshordi
Abstract:
Date: 20/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 20 Speaker(s): Niayesh Afshordi
Abstract:
Date: 18/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 19 Speaker(s): Niayesh Afshordi
Abstract:
Date: 14/11/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 18 Speaker(s): Niayesh Afshordi
Abstract:
Date: 13/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 17 Speaker(s): Niayesh Afshordi
Abstract:
Date: 11/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 16 Speaker(s): Niayesh Afshordi
Abstract:
Date: 07/11/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 15 Speaker(s): Niayesh Afshordi
Abstract:
Date: 06/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 14 Speaker(s): Niayesh Afshordi
Abstract:
Date: 04/11/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 13 Speaker(s): Niayesh Afshordi
Abstract:
Date: 31/10/2014 - 12:30 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 12 Speaker(s): Niayesh Afshordi
Abstract:
Date: 30/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 11 Speaker(s): Niayesh Afshordi
Abstract:
Date: 28/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 10 Speaker(s): Niayesh Afshordi
Abstract:
Date: 24/10/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 9 Speaker(s): Niayesh Afshordi
Abstract:
Date: 23/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 8 Speaker(s): Niayesh Afshordi
Abstract:
Date: 21/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 7 Speaker(s): Niayesh Afshordi
Abstract:
Date: 07/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 6 Speaker(s): Niayesh Afshordi
Abstract:
Date: 03/10/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 5 Speaker(s): Niayesh Afshordi
Abstract:
Date: 02/10/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 4 Speaker(s): Niayesh Afshordi
Abstract:
Date: 30/09/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | From Black Holes to Big Bang, and Back Speaker(s): Niayesh Afshordi
Abstract: By now, both black hole astrophysics and big bang cosmology are empirically well-established disciplines of physics and astronomy. They are also the only circumstances in nature where Einstein's general relativity can be seen in its full glory, and yet contain within them, its eventual and inevitabl... read more
Date: 30/09/2014 - 11:00 am
Series: Cosmology & Gravitation
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 | PHYS 781 - Lecture 3 Speaker(s): Niayesh Afshordi
Abstract:
Date: 26/09/2014 - 12:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 2 Speaker(s): Niayesh Afshordi
Abstract:
Date: 25/09/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | PHYS 781 - Lecture 1 Speaker(s): Niayesh Afshordi
Abstract:
Date: 23/09/2014 - 2:00 pm
Collection: PHYS 781 - Fundamentals of Astrophysics
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 | A Non-Local Reality: Is there a Phase Uncertainty in Quantum Mechanics? Speaker(s): Niayesh Afshordi, Elizabeth Gould
Abstract: A century after the advent of Quantum Mechanics and General Relativity, both theories enjoy incredible empirical success, constituting the cornerstones of modern physics. Yet, paradoxically, they suffer from deep-rooted, so-far intractable, conflicts. Motivations for violations of the notion ofrelat... read more
Date: 03/09/2013 - 3:30 pm
Series: Quantum Foundations
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 | Lorentz symmetry: Broken, intact or deformed? Speaker(s): Niayesh Afshordi, David Mattingly, Rafael Sorkin, Sabine Hossenfelder, Jurek Kowalski-Glikman, Stefano Liberati, Joao Magueijo, Daniel Sudarsky
Abstract: Is aether technically natural?I will discuss whether higher energy Lorentz violation should be considered a natural expectation in theories of quantum gravity with a preferred frame._____________________________If spacetime is a causal set then Lorentz symmetry is unbroken___________________________... read more
Date: 24/10/2012 - 3:30 pm
Collection: Experimental Search for Quantum Gravity 2012
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 | Photons and Quantum Gravity in Astrophysics Speaker(s): Alfio Bonanno, Robert Brandenberger, Joao Magueijo, Robert Nemiroff, Niayesh Afshordi, Giovanni Amelino-Camelia
Abstract: Asymptotically safe inflation and CMB polarizationThe presence of complex critical exponents in the scaling behavior of the Newton constant and Cosmological constant has dramatic consequences at the inflation scale. In particular an infinite number of unstable de-Sitter vacua emerges from ... read more
Date: 22/10/2012 - 4:30 pm
Collection: Experimental Search for Quantum Gravity 2012
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 | Modern Cosmology Speaker(s): Niayesh Afshordi
Abstract: This presentation
will cover a number of topics in cosmology today including dark energy, dark
matter and the cosmological constant.
Date: 09/07/2012 - 10:30 am
Series: Cosmology & Gravitation
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 | Trials and Tribulations of Aether Speaker(s): Niayesh Afshordi
Abstract: The tremendous empirical success of Einstein's relativity has pushed Aether into a chapter in the history books, for nearly a century. However, a phenomenologically consistent quantum mechanical treatment of gravity has motivated a revival of aether, by taming its UV-divergences, o... read more
Date: 09/05/2012 - 11:20 am
Collection: Conformal Nature of the Universe - 2012
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 | Structure in the Phase Space and Dark Matter Astronomy Speaker(s): Niayesh Afshordi
Abstract:
Date: 23/09/2011 - 3:40 pm
Collection: Unravelling Dark Matter Conference - 2011
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 | Cosmological constant problem: rethinking quantum and gravity Speaker(s): Niayesh Afshordi
Abstract:
Date: 22/05/2010 - 9:00 am
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 | Cosmology - Review (PHYS 621) - Lecture 5 Speaker(s): Niayesh Afshordi
Abstract:
Date: 04/12/2009 - 10:00 am
Collection: 09/10 PSI - Cosmology (Review)
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 | Cosmology - Review (PHYS 621) - Lecture 4 Speaker(s): Niayesh Afshordi
Abstract:
Date: 03/12/2009 - 10:00 am
Collection: 09/10 PSI - Cosmology (Review)
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 | Cosmology - Review (PHYS 621) - Lecture 3 Speaker(s): Niayesh Afshordi
Abstract:
Date: 02/12/2009 - 10:00 am
Collection: 09/10 PSI - Cosmology (Review)
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 | Cosmology - Review (PHYS 621) - Lecture 2 Speaker(s): Niayesh Afshordi
Abstract:
Date: 01/12/2009 - 10:00 am
Collection: 09/10 PSI - Cosmology (Review)
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 | Cosmology - Review (PHYS 621) - Lecture 1 Speaker(s): Niayesh Afshordi
Abstract:
Date: 30/11/2009 - 10:00 am
Collection: 09/10 PSI - Cosmology (Review)
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 | Cuscuton and Horava-Lifshitz gravity Speaker(s): Niayesh Afshordi
Abstract:
Date: 09/11/2009 - 11:00 am
Collection: Gravity at a Lifshitz Point - 2009
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 | Black hole horizons and the origin of cosmic acceleration Speaker(s): Niayesh Afshordi
Abstract: TBA
Date: 07/07/2009 - 3:00 pm
Collection: Holographic Cosmology Workshop - 2009
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 | Gravitational aether as a solution to the CC problem and more! Speaker(s): Niayesh Afshordi
Abstract:
Date: 27/05/2009 - 11:45 am
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 | (Towards) the end of the cosmological constant problem! Speaker(s): Niayesh Afshordi
Abstract: The cosmological constant problem is arguably the deepest gap in our understanding of modern physics. The discovery of cosmic acceleration in the past decade and its surprising coincidence with cosmic structure formation has added an extra layer of complexity to the problem. I will describe how revi... read more
Date: 19/03/2009 - 11:00 am
Series: Cosmology & Gravitation
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 | Lecture 14B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 04/12/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 14A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 04/12/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 13B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 27/11/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 13A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 27/11/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 12B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 20/11/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 12A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 20/11/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 11B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 13/11/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 11A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 13/11/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 10B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 06/11/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 10A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 06/11/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 9B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 30/10/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 9A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 30/10/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Observational Evidence for Massive Gravity Speaker(s): Niayesh Afshordi
Abstract:
Date: 23/10/2008 - 2:25 pm
Collection: PI CITA Joint Cosmology Day - 2008
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 | Astrophysics and Cosmology through Problems - 7B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 16/10/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 7A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 16/10/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 6B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 09/10/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 6A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 09/10/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 5B Speaker(s): Mark Wyman, Niayesh Afshordi
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 02/10/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 5A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 02/10/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 4B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 25/09/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 4A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 25/09/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Lecture 3B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 18/09/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 3A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 18/09/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 2B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 11/09/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 2A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 11/09/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 1B Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 04/09/2008 - 12:30 pm
Collection: Astrophysics & Cosmology Through Problems
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 | Astrophysics and Cosmology through Problems - 1A Speaker(s): Niayesh Afshordi, Mark Wyman
Abstract: This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various s... read more
Date: 04/09/2008 - 10:00 am
Collection: Astrophysics & Cosmology Through Problems
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 | Gravitational Aether as a solution to the cosmological constant problem Speaker(s): Niayesh Afshordi
Abstract:
Date: 03/06/2008 - 5:00 pm
Collection: PASCOS 08
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 | Primordial non-Gaussianity, statistics of collapsed objects, and the ISW effect Speaker(s): Niayesh Afshordi
Abstract:
Date: 10/03/2008 - 2:45 pm
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 | Physics beyond the Horizon Speaker(s): Niayesh Afshordi
Abstract: The history of human knowledge is often highlighted by our efforts to explore beyond our apparent horizon. In this talk, I will describe how this challenge has now evolved into our quest to understand the physics at/beyond the cosmological horizon, some twenty orders of magnitude above Columbus' ori... read more
Date: 20/02/2008 - 2:00 pm
Series: Colloquium
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 | Physics Beyond the Horizon Speaker(s): Niayesh Afshordi
Abstract: The history of human knowledge is often highlighted by our efforts to explore beyond our apparent horizon. In this talk, I will describe how this challenge has now evolved into our quest to understand the physics at/beyond the cosmological horizon, some twenty orders of magnitude above Columbuss ... read more
Date: 25/01/2008 - 3:00 pm
Series: Cosmology & Gravitation
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 | Missing Thermal Energy of the Universe Speaker(s): Niayesh Afshordi
Abstract:
Date: 10/11/2006 - 11:00 am
Collection: Cosmology on the Great Lakes Workshop
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