# 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.

## Standard Model - Review (PHYS 622) - Lecture 12

Tuesday Dec 15, 2009
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## Random quantum satisfiability: statistical mechanics of quantum optimization

Monday Dec 14, 2009
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Alongside the effort underway to build quantum computers, it is important to better understand which classes of problems they will find easy and which others even they will find intractable. Inspired by the success of the statistical study of classical constraint optimization problems, we study random ensembles of the QMA$_1$-complete quantum satisfiability (QSAT) problem introduced by Bravyi. QSAT appropriately generalizes the NP-complete classical satisfiability (SAT) problem.

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## Foundations of Quantum Mech. (PHYS 639) - Lecture 11

Monday Dec 14, 2009
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## Cosmology - Review (PHYS 621) - Lecture 11

Monday Dec 14, 2009
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## Standard Model - Review (PHYS 622) - Lecture 11

Monday Dec 14, 2009
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## Foundations of Quantum Mech. (PHYS 639) - Lecture 10

Friday Dec 11, 2009
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## Cosmology - Review (PHYS 621) - Lecture 10

Friday Dec 11, 2009
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## Standard Model - Review (PHYS 622) - Lecture 10

Friday Dec 11, 2009
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## Negative Energy and theGeneralized Second Law

Thursday Dec 10, 2009

In quantum field theory it is possible to create negative local energy densities. This would violate the Generalized Second Law (GSL) unless there is some sort of energy condition requiring the negative energy to be counterbalanced by positive energy. TO explore what this energy condition is, I will assume that the GSL holds in semiclassical gravity for all future causal horizons. From CPT symmetry it follows that the time-reverse of the GSL, properly understood, holds for all past causal horizons.

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## Colored group field theory: Scaling properties and positivity

Thursday Dec 10, 2009
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The scaling analysis in the large spin limit of Feynman amplitudes for the Bosonic colored group field theory are considered in any dimension starting with dimension 4. By an explicit integration of two colors, we show that the model is positive. This formulation could be useful for the constructive analysis of this type of models.

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## Next Public Lecture

### ENGINEERING CHANGE IN MEDICINE

Wednesday Dec 07, 2016

## RECENT PUBLIC LECTURE

### Michael Cates: Bulletproof Custard: Fluids That Stop Flowing When You Push Them Too Hard

Speaker: Michael Cates