# 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.

## Positive representations of quantum groups and higher Teichmuller theory

Monday Jan 23, 2017
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Positive representations are infinite-dimensional bimodules for the quantum group and its modular dual $\dpi{300}\inline U_{q^\vee}(\mathfrak{g}^\vee)$where both act by positive essentially self-adjoint operators.

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## Emergent Chiral Spin Liquids in Frustrated Magnetism

Friday Jan 20, 2017
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Topological states of matter are of of fundamental interest in contemporate condensed matter physics. Today, the fractional Quantum Hall effect remains the only known experimental system expected to exhibit intrinsic topological order. The question remains whether also different systems might stabilize this kind of ordering. Chiral spin liquids are an analogue of Fractional Quantum Hall Effect wave functions for spin systems.

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## PSI 2016/2017 Foundations of Quantum Mechanics (Review) - Lecture 14

Friday Jan 20, 2017
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## 2016/2017 Statistical Mechanics 2 - Roger Melko - Lecture 6

Friday Jan 20, 2017
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## PSI 2016/2017 Gravitational Physics (Review) - Lecture 14

Friday Jan 20, 2017
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## PSI 2016/2017 Standard Model (Review) - Lecture 14

Friday Jan 20, 2017
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## Emergent Friedmann dynamics with a quantum bounce from quantum gravity condensates

Thursday Jan 19, 2017
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I will explain how cosmological dynamics emerge from the hydrodynamics of isotropic group field theory condensate states in the Gross-Pitaevskii approximation. The correct Friedmann equations are recovered in the classical limit for some choices of the parameters in the action for the group field theory, and quantum gravity corrections arise in the high-curvature regime causing a bounce which generically resolves the big-bang and big-crunch singularities.

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## Multi-Messenger Astronomy with Advanced LIGO-Virgo

Thursday Jan 19, 2017
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The first detections of gravitational waves by LIGO-Virgo initiated the era of Gravitation-Wave Astronomy. Gravitational-waves serve as a new and independent probe of the Universe. In addition, the combination of gravitational-waves with information from other messengers, such as electromagnetic emission from the same source, will lead to a more complete and accurate understanding of cosmology and astrophysics.

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## PSI 2016/2017 Foundations of Quantum Mechanics (Review) - Lecture 13

Thursday Jan 19, 2017
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## Complete Reionization Constraints with Planck 2015 Polarization

Thursday Jan 19, 2017
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I will present a recent analysis of the Planck 2015 data that is complete in the reionization observables from large angle CMB polarization measurements using principal components (PC). By allowing for an arbitrary ionization history, this technique tests the robustness of total optical depth inferences from the usual instantaneous reionization assumption. A reliable measurement of the total optical depth is important for the interpretation of many other cosmological parameters such as the dark energy and neutrino mass.

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## Next Public Lecture

### A NEW ERA IN ASTRONOMY: NASA’S JAMES WEBB SPACE TELESCOPE

Wednesday Mar 01, 2017

## RECENT PUBLIC LECTURE

### James Weatherall: The Physics of Wall Street

Speaker: James Weatherall