Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.

# Vidéotheque

Since 2002 Perimeter Institute has been recording seminars, conference talks, public outreach events such as talks from top scientists using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.

Recordings of events in these areas are all available and On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

Accessibly by anyone with internet, Perimeter aims to share the power and wonder of science with this free library.

## Asymptotically Safe Amplitudes from the Quantum Effective Action

Mardi juil 14, 2020
Speaker(s):

This talk will feature a brief introduction to the gravitational asymptotic safety program before reviewing the current status of the field. Motivated by recent developments, I will introduce the form factor formulation of the quantum effective action and explain how various quantum gravity programs can be embedded into this framework. Finally, I will discuss a novel gravity-matter model whose scattering amplitudes exhibit all features expected from Asymptotic Safety.

Collection/Series:
Scientific Areas:

## Relieving the Hubble tension with primordial magnetic fields

Mardi juil 14, 2020
Speaker(s):

The standard cosmological model determined from the accurate cosmic microwave background measurements made by the Planck satellite implies a value of the Hubble constant H0 that is 4.2 standard deviations lower than the one determined from Type Ia supernovae. The Planck best fit model also predicts lower values of the matter density fraction Om and clustering amplitude S8 compared to those obtained from the Dark Energy Survey Year 1 data.

Collection/Series:
Scientific Areas:

## Progress in horizon thermodynamics

Mardi juil 14, 2020
Speaker(s):

I will review some developments in horizon thermodynamics from the past few years, highlighting especially the distinct notions of entropy that seem to apply to dynamically evolving black holes, and their extension from classical to semiclassical gravity.

Collection/Series:
Scientific Areas:

## Understanding of QG from string theory

Mardi juil 14, 2020
Speaker(s):
Collection/Series:
Scientific Areas:

## Lessons for quantum gravity from quantum information theory

Lundi juil 13, 2020
Speaker(s):

Gravity is unique among the other forces in that within general relativity we are able to do calculations which, when properly interpreted, give us information about non-perturbative quantum gravity. A classic example is Bekenstein and Hawking's calculation of the entropy of a black hole, and a more recent example is the calculation of the Page curve'' for certain evaporating black holes. A common feature of both of these calculations is that they compute entropies without using von Neumann's formula S=-Tr(\rho \log \rho).

Collection/Series:
Scientific Areas:

## Quantum gravity from the loop perspective

Lundi juil 13, 2020
Speaker(s):

I will summarise the main achievements of loop quantum gravity and provide my view on the issues that I consider of central importance for present and future efforts.

Collection/Series:
Scientific Areas:

Lundi juil 13, 2020
Speaker(s):

Condensed matter physics is the study of the complex behaviour of a large number of interacting particles such that their collective behaviour gives rise to emergent properties. We will discuss some interesting quantum condensed matter systems where their intriguing emergent phenomena arise due to strong coupling. We will revisit the Landau paradigm of Fermi liquid theory and hence understand the properties of the non-Fermi liquid systems which cannot be described within the Landau framework, due to the destruction of the Landau quasiparticles.

Collection/Series:
Scientific Areas:

## Approaches to Quantum Gravity: Key Achievements and Open Issues

Lundi juil 13, 2020
Speaker(s):

This talk will provide an overview of current approaches to quantum gravity, with their respective merits and open problems (`comparative quantum gravity'). To this aim I will focus on some key issues that must be addressed by all approaches

Collection/Series:
Scientific Areas:

## Welcome and Opening Remarks

Lundi juil 13, 2020
Speaker(s):
Collection/Series:
Scientific Areas:

## Space time fluctuations in AdS/CFT and Extensions to Minkowski

Mardi juil 07, 2020
Speaker(s):

Based on recent work arXiv:1902.08207 and arXiv:1911.02018 with E. Verlinde.

Collection/Series:
Scientific Areas:

## Lectures On-Demand

Watch on Perimeter's