# 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.

## Explorations in Cosmology (PHYS 649) - Lecture 14

Wednesday Mar 31, 2010
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## Topological insulators and topological superconductors

Wednesday Mar 31, 2010
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Recently, a new class of topological states has been theoretically predicted and experimentally realized. The topological insulators have an insulating gap in the bulk, but have topologically protected edge or surface states due to the time reversal symmetry. In two dimensions the edge states give rise to the quantum spin Hall (QSH) effect, in the absence of any external magnetic field. I shall review the theoretical prediction[1] of the QSH state in HgTe/CdTe semiconductor quantum wells, and its recent experimental observation[2].

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## Explorations in Numerical Relativity (PHYS 642) - Lecture 13

Wednesday Mar 31, 2010
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## Explorations in Particle Theory (PHYS 646) - Lecture 14

Wednesday Mar 31, 2010
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## Explorations in Cosmology - Lecture 13

Wednesday Mar 31, 2010
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## CauCats: the backbone of a quantum relativistic universe of interacting processes

Tuesday Mar 30, 2010
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Our starting point is a particular canvas' aimed to draw' theories of physics, which has symmetric monoidal categories as its mathematical backbone. With very little structural effort (i.e. in very abstract terms) and in a very short time this categorical quantum mechanics research program has reproduced a surprisingly large fragment of quantum theory. Philosophically speaking, this framework shifts the conceptual focus from `material carriers' such as particles, fields, or other

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## Quantum Field Theory for Cosmology - Lecture 21

Tuesday Mar 30, 2010
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## Foundations and Interpretation of Quantum Theory - Lecture 20

Tuesday Mar 30, 2010
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Macroscopic quantum coherence

## Explorations in Numerical Relativity (PHYS 642) - Lecture 12

Tuesday Mar 30, 2010
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## The Next-to-Simplest Quantum Field Theories

Tuesday Mar 30, 2010
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We apply newly-developed techniques for studying perturbative scattering amplitudes to gauge theories with matter. It is well known that the N=4 SYM theory has a very simple S-matrix; do other gauge theories see similar simplifications in their S-matrices? It turns out the one-loop gluon S-matrix simplifies if the matter representations satisfy some group theoretic constraints. In particular, these constraints can be expressed as linear Diophantine equations involving the higher order Indices (or higher-order Casimirs) of these representations.

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