# Video Library

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.

## PSI 2019/2020 - Statistical Mechanics (Vieira) - Lecture 3

Tuesday Oct 08, 2019
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## PSI 2019/2020 - Quantum Field Theory (Wohns/Xu) - Lecture 2

Tuesday Oct 08, 2019
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## PSI 2019/2020 - Statistical Mechanics (Vieira) - Lecture 2

Monday Oct 07, 2019
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## PSI 2019/2020 - Quantum Field Theory (Wohns/Xu) - Lecture 1

Monday Oct 07, 2019
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## General Relativity for Cosmology - Lecture 9

Friday Oct 04, 2019
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## Cohomology of hyperkahler manifolds

Thursday Oct 03, 2019
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I will talk about compact hyperkahler manifolds, which generalize the famous K3 surface to the higher dimensions. Given a compact simple hyperkahler manifold $M$, I will describe how the structure of cohomology algebra H*(M) is related with the so(b_2+2) Lie algebra action and the second cohomology group. I will explain how this is applied to the generalization of Kuga-Satake construction which allows us to assign for K3-type Hodge structure a Hodge structure of weight one (i.e. complex torus).

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## Challenges in gravitational wave astronomy

Thursday Oct 03, 2019
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Advanced LIGO and Advanced Virgo are currently in the middle of their third observing run, and releasing open public event alerts for the first time. The LIGO-Virgo collaboration has issued 29 un-retracted candidate event alerts as of September 20th, 2019, potentially adding dozens more known compact binary object mergers to the eleven confident LIGO-Virgo detections from the first two Advanced-era observing runs. I’ll review novel LIGO-Virgo results to date, and discuss the challenges of extracting interesting new physics from noisy detector data.

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## Sir Martin Rees, UK Astronomer Royal

Wednesday Oct 02, 2019

Advances in biotech, cyber-technology, robotics, and space exploration could, if applied wisely, allow a bright future – even for 10 billion people – by the end of this century.

But there are dystopian risks we ignore at our peril.

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## Looking for hypermassive neutron stars

Wednesday Oct 02, 2019
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Hypermassive neutron stars (HMNS) can be briefly formed after a binary neutron star merger and are likely to be highly deformed and strongly oscillating. These oscillations may be seen as modulation of the associated short gamma-ray burst and could provide observational evidence for the HMNS phase. I will discuss the prospects for their detection and the important physical information that can be gained by their observation.

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## The Cohomology of Groups (Johnson-Freyd/Guo) - Lecture 1

Wednesday Oct 02, 2019
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## Lectures On-Demand

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