Cosmologists at Perimeter Institute seek to help pin down the constituents and history of our universe, and the rules governing its origin and evolution. Many of the most interesting clues about physics beyond the standard model (e.g., dark matter, dark energy, the matter/anti-matter asymmetry, and the spectrum of primordial density perturbations], come from cosmological observations, and cosmological observations are often the best way to test or constrain a proposed modification of the laws of nature, since such observations can probe length scales, time scales, and energy scales that are beyond the reach of terrestrial laboratories.
Displaying 25 - 36 of 2118
Format results
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24 talks-Collection NumberC17021
Talk
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General Relativity for Cosmology - Lecture 1
University of Waterloo -
General Relativity for Cosmology - Lecture 2
University of Waterloo -
General Relativity for Cosmology - Lecture 3
University of Waterloo -
General Relativity for Cosmology - Lecture 4
University of Waterloo -
General Relativity for Cosmology - Lecture 5
University of Waterloo -
General Relativity for Cosmology - Lecture 6
University of Waterloo -
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General Relativity for Cosmology - Lecture 8
University of Waterloo
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Bounce Scenarios in Cosmology
16 talks-Collection NumberC17024Talk
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Welcome and Opening Remarks
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University of Sheffield
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University of Edinburgh
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Bounce in Loop Quantum Cosmology and its Implications
Pennsylvania State University -
Observable Consequences of a Bounce
Canadian Institute for Theoretical Astrophysics (CITA) -
Challenges for Bouncing Cosmologies
McGill University - Department of Physics -
Emergent bouncing cosmology from quantum gravity condensates
University of New Brunswick -
Discussion Session 2
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TotalEnergies (France)
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University of Sheffield
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Arthur B. McDonald Canadian Astroparticle Physics Research Institute
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PSI 2016/2017 - Explorations in Cosmology (Smith)
14 talks-Collection NumberC17012Talk
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PSI 2016/2017 - Explorations in Cosmology - Lecture 1
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 2
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 3
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 4
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 5
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 6
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 7
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Cosmology - Lecture 8
Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Cosmology (Kubiznak)
15 talks-Collection NumberC17003Talk
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PSI 2016/2017 - Cosmology (Review) - Lecture 1
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 2
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 3
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 4
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 5
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 6
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 7
Charles University -
PSI 2016/2017 - Cosmology (Review) - Lecture 8
Charles University
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Time in Cosmology
14 talks-Collection NumberC16016Talk
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Welcome and Opening Remarks
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Institute for Astrophysics and Space Sciences
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Perimeter Institute for Theoretical Physics
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University of Edinburgh
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The origin of arrows of time II
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California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
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Institute for Astrophysics and Space Sciences
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Technical University of Applied Sciences Würzburg-Schweinfurt
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The origin of arrows of time II cont.
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California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
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Institute for Astrophysics and Space Sciences
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Technical University of Applied Sciences Würzburg-Schweinfurt
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Testing time asymmetry in the early universe
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University of California, San Diego
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University of Lisbon
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University of California, Berkeley
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The fate of the big bang
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Pennsylvania State University
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University of Edinburgh
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Time as Organization – Downward Caustation, Structure and Complexity I
Technische Universität Darmstadt -
Time as Organization – Downward Caustation, Structure and Complexity II
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Santa Fe Institute
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University of Cape Town
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Cosmological Frontiers in Fundamental Physics 2016
21 talks-Collection NumberC16009Talk
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Welcome and Opening Remarks
PIRSA:16060006 -
Dark matter phenomenology across cosmic times
Johns Hopkins University -
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A new probe of primordial magnetic fields at high redshift
University of Southern California -
Turbulent gravity in asymptotically AdS spacetimes
University of Nottingham -
Black hole ringdown and quasinormal modes
The University of Texas at Austin
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Feedback over 44 Orders of Magnitude: From Gamma-rays to the Universe
22 talks-Collection NumberC16004Talk
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30000 foot view of blazar heating
Universität Heidelberg - Institut für Theoretische Physik -
The basics and not-so-basic physics of beam plasmas
University of Castilla-La Mancha -
The Basics of the Gamma-ray Sky: current observational status and future perspectives
Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI) -
The thermal state of the intergalactic medium and its effect on galaxy formation
University of Washington -
Models of Galaxy formation: Current constraints on the star formation history and feedback
University of Massachusetts Amherst -
Nonlinear Plasma Instabilities
University of Wisconsin-Milwaukee -
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Superluminality in Effective Field Theories for Cosmology
17 talks-Collection NumberC15019Talk
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Causal structures in Massive gravity and Gauss-Bonnet gravity
National Taiwan University -
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Causality constraints and the lightcone
Swansea University -
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Lecture - Relativity, PHYS 604
Perimeter Institute for Theoretical Physics -
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Lecture - Relativity, PHYS 604
Perimeter Institute for Theoretical Physics -
Lecture - Relativity, PHYS 604
Perimeter Institute for Theoretical Physics
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General Relativity for Cosmology (PHYS786/AMATH875) - Achim Kempf
24 talks-Collection NumberC17021General Relativity for Cosmology (PHYS786/AMATH875) - Achim Kempf -
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PSI 2016/2017 - Explorations in Cosmology (Smith)
14 talks-Collection NumberC17012PSI 2016/2017 - Explorations in Cosmology (Smith) -
PSI 2016/2017 - Cosmology (Kubiznak)
15 talks-Collection NumberC17003PSI 2016/2017 - Cosmology (Kubiznak) -
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Cosmological Frontiers in Fundamental Physics 2016
21 talks-Collection NumberC16009Cosmological Frontiers in Fundamental Physics 2016 -
Feedback over 44 Orders of Magnitude: From Gamma-rays to the Universe
22 talks-Collection NumberC16004Feedback over 44 Orders of Magnitude: From Gamma-rays to the Universe
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Superluminality in Effective Field Theories for Cosmology
17 talks-Collection NumberC15019Superluminality in Effective Field Theories for Cosmology -
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dRGT ghost-free massive gravity in spherical symmetry
Emma AlbertiniIn my talk, I will argue that symmetry strongly changes the behaviour of massive gravity relative to its massless sibling. After reviewing the formulation of dRGT theory of ghost-free massive gravity, I will examine the minimal model and next-to-minimal model in spherical symmetry. Although the latter has been argued to have a good Vainshtein mechanism in spherical symmetry, I will derive a restriction on non-relativistic matter that is at odds with a reasonable phenomenology. Moreover, the theory cannot reproduce the same behaviour as GR for a scalar field collapse in the small mass limit without encountering a singularity at some point in the evolution. Since symmetry is the epitome of non-genericity, the resolution may well be that we should forgo symmetry and focus on more generic behaviour in massive gravity to study the screening mechanism. This talk is based on https://arxiv.org/pdf/2409.18802 -
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