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.

## Coulomb Phases and Anomalies: Geometric Approach to 5d/6d Theories

Mercredi fév 20, 2019
Speaker(s):

I will review the geometric approach to the description of Coulomb branches and Chern-Simons terms of gauge theories coming from compactifications of M-theory on elliptically fibered Calabi-Yau threefolds. Mathematically, this involves finding all the crepant resolutions of a given Weierstrass model and understanding the network of flops connecting them together with computing certain topological invariants. I will further check that the uplifted theory in 6d is anomaly-free using Green-Schwartz mechanism.

Collection/Series:
Scientific Areas:

## Quantum Fields and Strings Seminar

Mardi fév 19, 2019
Speaker(s):

Seminar given remotely.

Collection/Series:
Scientific Areas:

## Topological Holography Course - Lecture 2

Vendredi fév 15, 2019
Speaker(s):
Scientific Areas:

## PSI 2018/2019 - Gravitational Physics - Lecture 14

Vendredi fév 15, 2019
Speaker(s):

Gravitational instantons: false vacuum decay

## PSI 2018/2019 - Standard Model Review - Lecture 13

Vendredi fév 15, 2019
Speaker(s):

Mixed anomalies, Global anomalies

## PSI 2018/2019 - Gravitational Physics - Lecture 13

Jeudi fév 14, 2019
Speaker(s):

Gravitational perturbation theory, perturbing Randall-Sundrum

## PSI 2018/2019 - Gravitational Physics - Lecture 12

Jeudi fév 14, 2019
Speaker(s):

Warped compactifications: Rubakov-Shaposhnikov & Randall-Sundrum toy models

## PSI 2018/2019 - Standard Model Review - Lecture 12

Jeudi fév 14, 2019
Speaker(s):

Abelian gauge anomalies

## Decay of correlations in long-range interacting systems at non-zero temperature

Mercredi fév 13, 2019

We study correlations in fermionic systems with long-range interactions in thermal equilibrium. We prove an upper-bound on the correlation decay between anti-commut-ing operators based on long-range Lieb-Robinson type bounds. Our result shows that correlations between such operators in fermionic long-range systems of spatial dimension $D$ with at most two-site interactions decaying algebraically with the distance with an exponent $\alpha \geq 2\,D$, decay at least algebraically with an exponent arbitrarily close to $\alpha$.

Scientific Areas:

## Numerical decomposition of finite dimensional group representations

Mercredi fév 13, 2019
Speaker(s):

Group representations are ubiquitous in quantum information theory. Many important states or channels are invariant under particular symmetries: for example depolarizing channels, Werner states, isotropic states, GHZ states. Accordingly, computations involving those objects can be simplified by invoking the symmetries of the problem. For that purpose, we need to know which irreducible representations appear in the problem, and how.

Collection/Series:
Scientific Areas:

## Next Public Lecture

### CHAD HANNA: PENNSYLVANIA STATE UNIVERSITY

Mercredi avr 03, 2019

## LECTURES ON-DEMAND

### Jocelyn Bell Burnell: University of Oxford

Speaker: Jocelyn Bell Burnell