# 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.

## Metabolic Pathways for Gamma-Ray Bursts

Thursday Jul 28, 2011
Speaker(s):

There is now a consensus that gamma-ray bursts involve
extraordinary power outputs, and highly relativistic dynamics.
The trigger is probably a binary merger or collapse involving
compact objects. The most plausible progenitors, ranging from
NS-NS mergers to various hypernova-like scenarios, eventually
lead to the formation of a black hole with a debris torus around it.
The various modes of energy extraction from such systems are discussed.

Collection/Series:
Scientific Areas:

## From the Biggest Things to the Biggest Bang

Friday Jul 22, 2011
Speaker(s):

Assuming that you are really (really) strong, what are the biggest objects in the Universe that hold together enough that you could throw them? What are they made of and why are they so big? In this talk, I will show how studies of the large scale structure of the Universe enable us to reconstruct the initial conditions at the Big-Bang and test the fundamental laws of physics.

Collection/Series:
Scientific Areas:

## The Dark Side of the Universe

Thursday Jul 21, 2011
Speaker(s):

What is the Universe made of? Recent observations suggest surprising results: not only most of the matter in the Universe is dark and unconventional but, more surprisingly, the major component of the Universe may be in the form of 'dark energy' -- a form of energy that opposes the pull of gravity and causes the expansion of the universe to accelerate. By combining recent observations of clusters of galaxies, distant supernovae, and the cosmic microwave background, we find evidence for a Universe that has only 5% 'normal' baryonic matter, 20% non-baryonic dark matter, and 75% 'dark energy'.

## Progress and Challenges for Canadian Female Physicists

Thursday Jul 21, 2011

In recent years there has been an increase in the number of women in all academic levels in physical and applied sciences in Canada. Despite the modern feminist movement the number of women in physics continues to be less than the number of men, particularly in higher and leadership positions. As there is no rational reason for women to trail men in achieving new scientific discoveries or excel in academic teaching, the cause of this is attributed to existing gender biases in the perception and practice of science.

## Physics Education Research: Helping Students Become Better Scientists

Thursday Jul 21, 2011
Speaker(s):

Physics Education Research (PER) is a blossoming subfield of physics that is changing the way students become physicists. Our research involves the transformation of the lab portion of a first-year enriched physics course through the implementation of “invention activities:” discovery-learning activities that ask students to “invent” a solution to a problem before being taught the expert solution.

## Exploring the Viscoelastic Properties of PAA Phantoms

Thursday Jul 21, 2011
Speaker(s):

A gel that has similar thermodynamic properties to human tissue is necessary for determining the safety of implanted medical devices during magnetic resonance imaging (MRI). One particular gel recommended by the ASTM standard (F218209) is the polyacrylic acid (PAA) phantom. In this work, PAA mixtures were characterized by measuring viscosity (as a function of shear rate), electrical conductivity, thermal conductivity, and elastic and viscous moduli (as a function of frequency).

## Crystallinity, Magnetic and Electrical Properties of Doped Perovskite-Oxid

Thursday Jul 21, 2011
Speaker(s):

Sepiedeh Pirasteh

## QCD Confinement at Finite Chemical Potential and the Gravity Dual

Thursday Jul 21, 2011
Speaker(s):

## Testing the Nature of Black Hole Candidates

Thursday Jul 21, 2011
Speaker(s):

Today there is robust observational evidence of dark and compact objects in X-ray binary systems with a mass of 5-20 $M_\odot$ and in galactic nuclei with a mass of $10^5 - 10^9$ $M_\odot$. The conjecture is that all these objects are the Kerr black holes predicted by General Relativity, as they cannot be explained otherwise without introducing new physics. However, there are no directs observational evidences. In this talk, I discuss how the Kerr black hole hypothesis can be tested with present and future X-ray data and the current constraints on the nature of this objects.

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## Spectroscopic Study of Atmospheric Trace Gases

Thursday Jul 21, 2011
Speaker(s):

Molecular spectroscopy offers the tools and instrumentation needed to unveil the structure and characteristics of molecules that are found within planetary atmospheres. In order to do this we examine the frequencies of light that these molecules either absorb or emit. It is the fine structure of these absorption or emission features that give us information about their physical state.. In our lab we use a near-infrared source to probe various molecules and examine absorption features and their dependency on both temperature and pressure.

## Next Public Lecture

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

## LECTURES ON-DEMAND

### Jocelyn Bell Burnell: University of Oxford

Speaker: Jocelyn Bell Burnell