# 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.

## From precision to accuracy: cosmology with large imaging surveys

Tuesday Apr 07, 2015
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Photometric surveys are often larger and extend to fainter magnitudes than spectroscopic samples, and can therefore yield more precise cosmological measurements. However, photometric data are significantly contaminated by multiple sources of systematics, either intrinsic, observational, or instrumental. These systematics affect the properties of the raw images in complex ways, propagate into the final catalogues, and create spurious spatial correlations.

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## Explorations in Cosmology-2

Tuesday Apr 07, 2015
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## Explorations in Particle Theory-2

Tuesday Apr 07, 2015
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## Explorations in String Theory -1

Monday Apr 06, 2015
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## Explorations in Cosmology-1

Monday Apr 06, 2015
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## Explorations in Particle Theory-1

Monday Apr 06, 2015
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## Modified Gravity, Dark Matter and Black Hole Shadows

Thursday Apr 02, 2015
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A modified gravity (MOG) theory has been developed over the past decade that can potentially fit all the available data in cosmology and the present universe. The basic ingredients of the theory are described by an action principle determined by the Einstein-Hilbert metric tensor and curvature tensor. An additional massive vector field φµ is sourced by a gravitational charge $Q=\sqrt{\alpha G_N}M$, where $\alpha$ is a parameter, $G_N$ is Newton's gravitational constant and $M$ is the mass of a body.

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## Explorations in Condensed Matter-14

Thursday Apr 02, 2015
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## Explorations in Quantum Information-14

Thursday Apr 02, 2015
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## The Most Wanted Particle

Wednesday Apr 01, 2015
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Jon Butterworth, University College London

The Most Wanted Particle

Perimeter Institute Public Lecture

WEDNESDAY, April 1 at 7:00 pm

Mike Lazaridis Theatre of Ideas

Perimeter Institute

31 Caroline St. N., Waterloo

Tickets available online on Monday, March 16 at 9:00 am.

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## Next Public Lecture

### Amanda Peet, University of Toronto and Perimeter Institute

Wednesday May 06, 2015

## RECENT PUBLIC LECTURE

### The Most Wanted Particle

Speaker: Jon Butterworth