# 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.

## Spatially Covariant Theories of a Transverse, Traceless Graviton

Tuesday Nov 15, 2011
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General relativity is a covariant theory of two transverse, traceless graviton degrees of freedom. According to a theorem of Hojman, Kuchar, and Teitelboim, modifications of general relativity must either introduce new degrees of freedom or violate the principle of general covariance. In my talk, I will discuss modifications of general relativity that retain the same number of gravitational degrees of freedom, and therefore explicitly break general covariance. Motivated by cosmology, the modifications of interest maintain spatial covariance.

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## Condensed Matter - Lecture 12

Tuesday Nov 15, 2011
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## Transport on the Surface of Weak Topological Insulators

Tuesday Nov 15, 2011
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Weak topological insulators have an even number of Dirac cones in their surface spectrum and are thought to be unstable to disorder, which leads to an insulating surface. Here we argue that the presence of disorder alone will not localize the surface states, rather, the presence of a time-reversal symmetric mass term is required for localization.

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## Quantum Field Theory II - Lecture 12

Tuesday Nov 15, 2011
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## Condensed Matter - Lecture 11

Monday Nov 14, 2011
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## Quantum Field Theory II - Lecture 11

Monday Nov 14, 2011
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## Results on Searches from the CMS Experiment at the LHC

Friday Nov 11, 2011
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The LHC has just concluded this year's proton-proton run at 7 TeV CM energy, producing more than 5fb-1of data.
While the full data sample collected by the CMS experiment will be analyzed over the winter, many of the present searches
for new physics have been completed with 1-2 fb-1. In this talk we will present the most recent updates on the search analyses in CMS, including
the Higgs search, searches for supersymmetry, and a plethora of other BSM models, such as extra dimensions, Z's, W_R, leptoquarks, and more.

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## Quantum Field Theory II - Lecture 10

Friday Nov 11, 2011
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## Condensed Matter - Lecture 10

Friday Nov 11, 2011
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## Higher-Spin Interactions: Three-point Functions and Beyond

Thursday Nov 10, 2011
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Taking String Theory as a theoretical laboratory'', I will present handy expressions for bosonic and fermionic (SUSY) higher-spin Noether currents. I will also describe a class of non-local higher-spin Lagrangian couplings that are generically required by the Noether procedure starting from four-points. The construction clarifies the origin of old problems for these systems and links String Theory to some aspects of Field Theory that go beyond its conventional low energy limit.

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## Next Public Lecture

Check back for details on the next lecture in Perimeter's Public Lectures Series

## LECTURES ON-DEMAND

### Roger Melko: Perimeter Institute and University of Waterloo

Speaker: Roger Melko