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 Number C17053
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 Number C17021Talk
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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 Number C17024Talk
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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 Perimeter Institute for Theoretical Physics
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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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Unitary Cosmological Bounces
Claudia de Rham Unknown School - United Kingdom
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Quantum cosmological instabilities - with and without boundaries
Jean-Luc Lehners Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI) - Theoretical Cosmology
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PSI 2016/2017 - Explorations in Cosmology (Smith)
14 talks-Collection Number C17012Talk
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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 Number C17003Talk
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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 Number C16016Talk
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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 and time I
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David Albert Columbia University
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Steve Weinstein University of Waterloo
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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 Universidad Nacional Autónoma De Mexico (UNAM)
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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 Universidad Nacional Autónoma De Mexico (UNAM)
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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 System
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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 (SFI)
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George Ellis University of Cape Town
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Cosmological Frontiers in Fundamental Physics 2016
21 talks-Collection Number C16009Talk
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Dark matter phenomenology across cosmic times
Yacine Ali-Haimoud Johns Hopkins University
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The Classicality Puzzle
Jean-Luc Lehners Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI) - Theoretical Cosmology
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Inhomogeneous Anisotropic Cosmology
Leonardo Senatore SLAC National Accelerator Laboratory
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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 Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
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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 Number C16004Talk
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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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PI-CITA Day 2015
-Collection Number C15090 -
Superluminality in Effective Field Theories for Cosmology
17 talks-Collection Number C15019Talk
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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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Probing exotic energy injection with the CMB and early star formation
Wenzer Qin Massachusetts Institute of Technology (MIT)
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PSI 2017/2018 - Cosmology (Smith)
15 talks-Collection Number C17053PSI 2017/2018 - Cosmology (Smith) -
General Relativity for Cosmology (PHYS786/AMATH875) - Achim Kempf
24 talks-Collection Number C17021General Relativity for Cosmology (PHYS786/AMATH875) - Achim Kempf -
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PSI 2016/2017 - Explorations in Cosmology (Smith)
14 talks-Collection Number C17012PSI 2016/2017 - Explorations in Cosmology (Smith) -
PSI 2016/2017 - Cosmology (Kubiznak)
15 talks-Collection Number C17003PSI 2016/2017 - Cosmology (Kubiznak) -
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Cosmological Frontiers in Fundamental Physics 2016
21 talks-Collection Number C16009Cosmological Frontiers in Fundamental Physics 2016 -
Feedback over 44 Orders of Magnitude: From Gamma-rays to the Universe
22 talks-Collection Number C16004Feedback 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 Number C15019Superluminality in Effective Field Theories for Cosmology -
Constraining a constant and tomographic Coupled Dark Energy model with low and high redshift probes
Lisa Goh CEA Saclay
The current ΛCDM concordance model has been widely successful in describing our Universe. However, crucial questions, such as the H0 tension, remain unanswered and are becoming increasingly critical with the continuous release of high-precision cosmological data. This has led to the exploration of modified ΛCDM models, one of them being the coupled quintessence, or Coupled Dark Energy (CDE) model. Here, we perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrised and constrained in different redshift bins. We employ cosmic microwave background data from Planck, ACT and SPT, showing the impact of different choices that can be made in combining these datasets. Then, we use a range of low redshift probes to test CDE cosmologies, both for a constant and a tomographic coupling. In particular, we use for the first time data from weak lensing, galaxy clustering, and 3x2pt galaxy-galaxy lensing cross-correlation data. For CMB and background datasets, a tomographic coupling allows for β values up to one order of magnitude larger than in previous works, in particular at z < 1. The use of 3x2pt analysis then becomes important to constrain β at low redshifts, even when coupling is allowed to vary: for 3x2pt we find, at 0.5 < z < 1, β = 0.018+0.007 −0.011, comparable to what CMB and background datasets would give for a constant coupling. This makes upcoming galaxy surveys potentially powerful probes to test CDE models at low redshifts.
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Zoom link https://pitp.zoom.us/j/94442666279?pwd=OTgrMTZ5dTRzZmc2WFhuMkF3ekJzdz09
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Probing exotic energy injection with the CMB and early star formation
Wenzer Qin Massachusetts Institute of Technology (MIT)
Dark matter interactions with Standard Model particles can inject energy at early times, altering the standard evolution of the early universe. In particular, this energy injection can perturb the spectrum of the cosmic microwave background (CMB) away from that of a perfect blackbody, alter the CMB anisotropy spectrum, and affect processes by which the first stars form. For this study, I will discuss recent work to upgrade the DarkHistory code package to more carefully track interactions among low energy electrons, hydrogen atoms, and radiation, in order to accurately compute the evolution of the CMB spectral distortion in the presence of Dark Matter energy injection. I will show results for the contribution to the spectral distortions from redshifts z < 3000 for arbitrary energy injection scenarios, new CMB anisotropy constraints on light dark matter, as well as the effect of exotic energy injection on early star formation.
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Zoom link https://pitp.zoom.us/j/99559611185?pwd=bDFVdmpyVE5CbXVXVHdEL29Md0FXUT09