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.
Format results
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15 talks-Collection NumberC17053
Talk
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PSI 2017/2018 - Cosmology - Lecture 1
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 2
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 3
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 4
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 5
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 6
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 7
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Cosmology - Lecture 8
Kendrick Smith Perimeter Institute for Theoretical Physics
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General Relativity for Cosmology (PHYS786/AMATH875) - Achim Kempf
24 talks-Collection NumberC17021Talk
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General Relativity for Cosmology - Lecture 1
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 2
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 3
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 4
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 5
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 6
Achim Kempf University of Waterloo
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General Relativity for Cosmology - Lecture 8
Achim Kempf 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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Steffen Gielen University of Sheffield
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Neil Turok University of Edinburgh
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Bounce in Loop Quantum Cosmology and its Implications
Abhay Ashtekar Pennsylvania State University
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Observable Consequences of a Bounce
Ue-Li Pen Canadian Institute for Theoretical Astrophysics (CITA)
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Challenges for Bouncing Cosmologies
Robert Brandenberger McGill University - Department of Physics
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Emergent bouncing cosmology from quantum gravity condensates
Edward Wilson-Ewing University of New Brunswick
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Discussion Session 2
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Angelika Fertig TotalEnergies (France)
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Steffen Gielen University of Sheffield
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Elizabeth Gould 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
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 2
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 3
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 4
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 5
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 6
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 7
Kendrick Smith Perimeter Institute for Theoretical Physics
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PSI 2016/2017 - Explorations in Cosmology - Lecture 8
Kendrick Smith 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
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 2
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 3
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 4
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 5
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 6
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 7
David Kubiznak Charles University
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PSI 2016/2017 - Cosmology (Review) - Lecture 8
David Kubiznak 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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Marina Cortes Institute for Astrophysics and Space Sciences
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Lee Smolin Perimeter Institute for Theoretical Physics
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Neil Turok University of Edinburgh
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The origin of arrows of time II
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Sean Carroll California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
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Marina Cortes Institute for Astrophysics and Space Sciences
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Tim Koslowski Technical University of Applied Sciences Würzburg-Schweinfurt
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The origin of arrows of time II cont.
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Sean Carroll California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
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Marina Cortes Institute for Astrophysics and Space Sciences
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Tim Koslowski Technical University of Applied Sciences Würzburg-Schweinfurt
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Testing time asymmetry in the early universe
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Brian Keating University of California, San Diego
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Andrew Liddle University of Lisbon
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Richard Muller University of California, Berkeley
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The fate of the big bang
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Abhay Ashtekar Pennsylvania State University
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Neil Turok University of Edinburgh
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Time as Organization – Downward Caustation, Structure and Complexity I
Barbara Drossel Technische Universität Darmstadt
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Time as Organization – Downward Caustation, Structure and Complexity II
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Stuart Kauffman Santa Fe Institute
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George Ellis 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
Yacine Ali-Haimoud Johns Hopkins University
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A new probe of primordial magnetic fields at high redshift
Vera Gluscevic University of Southern California
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Turbulent gravity in asymptotically AdS spacetimes
Stephen Green University of Nottingham
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Black hole ringdown and quasinormal modes
Aaron Zimmerman 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
Christoph Pfrommer Universität Heidelberg - Institut für Theoretische Physik
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The basics and not-so-basic physics of beam plasmas
Antoine Bret University of Castilla-La Mancha
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The Basics of the Gamma-ray Sky: current observational status and future perspectives
Jim Hinton Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
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The thermal state of the intergalactic medium and its effect on galaxy formation
Matthew McQuinn University of Washington
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Models of Galaxy formation: Current constraints on the star formation history and feedback
Hojun Mo University of Massachusetts Amherst
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Nonlinear Plasma Instabilities
Philip Chang 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
Keisuke Izumi National Taiwan University
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Causality constraints and the lightcone
Timothy Hollowood Swansea University
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The Cosmic Neutrino Background
Douglas Scott University of British Columbia
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PSI 2017/2018 - Cosmology (Smith)
15 talks-Collection NumberC17053PSI 2017/2018 - Cosmology (Smith) -
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 -
Cosmic Recombination with Primordial Magnetic Fields and the Hubble Tension.
Levon PogosianPrimordial Magnetic Fields (PMFs), long studied as potential relics of the early Universe, can accelerate recombination and have been proposed as a possible solution to the Hubble tension. In this seminar, I will present the latest observational evidence supporting this idea, based on comprehensive magnetohydrodynamic (MHD) simulations of recombination in the presence of PMFs. Current Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillation (BAO) data exhibit a mild preference for PMFs while predicting a higher Hubble constant. Notably, the inferred field strengths align with those required to explain galaxy cluster magnetic fields purely from primordial origins, eliminating the need for additional dynamo amplification or stellar contributions. Future high-resolution CMB temperature and polarization measurements will be crucial in confirming or further constraining the role of PMFs during recombination. -
The Cosmic Neutrino Background
Douglas Scott University of British Columbia
The cosmic neutrino background is like the cosmic microwave background, but less photon-y and more neutrino-ey. The CNB is also less talked about than the CMB, mostly because it's nearly impossible to detect directly. But if it could be detected, it would be interesting in several ways that are discussed.
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Quantum droplets of dark matter
Ian Moss Newcastle University
Vacuum polarisation can destabilise dark matter models made from ultralight, weakly coupled scalar fields. The dark matter condenses into quantum droplets, like those seen in Bose Einstein condensates, and could contribute to explaining some cosmological conundrums.