# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events 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 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.

## Relaxion from particle production

Tuesday Mar 07, 2017

Recently a new solution to the hierarchy problem was proposed which makes use of the cosmological evolution of a light scalar field, a scanner, instead of symmetry or anthropic arguments to select a small Higgs mass. In the original proposal this scanner field could be the QCD axion and thus such class of solution became known as relaxion’’.

Collection/Series:
Scientific Areas:

## PSI 2016/2017 Introduction to Quantum Integrable Systems - Lecture 11

Tuesday Mar 07, 2017
Speaker(s):

## Extraordinary Physics with Millisecond Pulsars

Tuesday Mar 07, 2017
Speaker(s):

Pulsars are some of physics and astrophysics’ most exotic objects, and they have already earned two Nobel Prizes. We currently know of about 2500 of them in our Galaxy, but a small subset, the millisecond pulsars (MSPs), are truly remarkable. These systems are notoriously hard to detect, yet their numbers have more than doubled in the past 5 years via surveys using the world’s most sensitive

Collection/Series:
Scientific Areas:

## PSI 2016/2017 String Theory (Review) - Lecture 10

Tuesday Mar 07, 2017
Speaker(s):

## PSI 2016/2017 Quantum Information (Review) - Lecture 10 (Eduardo Martin-Martinez)

Tuesday Mar 07, 2017
Scientific Areas:

## PSI 2016/2017 Introduction to Quantum Integrable Systems - Lecture 10

Monday Mar 06, 2017
Speaker(s):

## Unlocking the potential of pulsar timing arrays

Monday Mar 06, 2017
Speaker(s):

Galaxy mergers are a standard aspect of galaxy formation and evolution, and most (likely all) large galaxies contain supermassive black holes. As part of the merging process, the supermassive black holes should in-spiral together and eventually merge, generating both continuous gravitational waves and a background of gravitational radiation in the nanohertz to microhertz regime.  An array of precisely timed pulsars spread across the sky can form a galactic-scale gravitational wave detector in the nanohertz band.

Collection/Series:

## PSI 2016/2017 String Theory (Review) - Lecture 9

Monday Mar 06, 2017
Speaker(s):

## PSI 2016/2017 Quantum Information (Review) - Lecture 9 (Eduardo Martin-Martinez)

Monday Mar 06, 2017
Scientific Areas:

## Arithmetic Structures in Spectral Models of Gravity

Friday Mar 03, 2017
Speaker(s):

The spectral action functional of noncommutative geometry provides a model of Euclidean (modified) gravity, possibly coupled to matter. The terms in the large energy asymptotic expansion of the spectral action can be computed via pseudodifferential calculus. In the case of highly symmetric spacetimes, like Robertson-Walker metrics and Bianchi IX gravitational instantons, there is a richer arithmetic structure in the spectral action, and the terms in the asymptotic expansion are expressiblein terms of periods of motives and of modular forms.

Collection/Series:

## Next Public Lecture

### EUGENIA CHENG: HOW TO BAKE PI

Wednesday Apr 05, 2017

## RECENT PUBLIC LECTURE

### Amber Straughn: A New Era in Astronomy: NASA’s James Webb Space Telescope

Speaker: Amber Straughn