# 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.

## Mechanics and Thermodynamics can be fundamentally united by density operators with an ontic status obeying a locally maximum entropy production dynamics. But at what price?

Thursday Oct 01, 2009
Speaker(s):

Perhaps the earliest explicit ansatz of a truly ontic status for the density operator has been proposed in [G.N. Hatsopoulos and E.P. Gyftopoulos, Found. Phys., Vol.6, 15, 127, 439, 561 (1976)].

Scientific Areas:

## Quantum Field Theory (PHYS 601) - Lecture 4

Thursday Oct 01, 2009
Speaker(s):

## PIAF 09 - Panel Discussion

Wednesday Sep 30, 2009
Speaker(s):

TBA

Scientific Areas:

## Brane interactions: the origin of space-time dimensionality and the physics of cosmic superstrings

Wednesday Sep 30, 2009
Speaker(s):

Collisions and subsequent decays of higher dimensional branes leave
behind three-dimensional branes, one of which could play the role of
our universe. This process also leads to the production of
one-dimensional branes, D-strings, and fundamental ones (F-strings),
known as cosmic superstrings. In the first part of this talk, I will discuss the mechanism we have proposed in order to explain the origin of the space-time dimensionality, while in the second part I will review formation and dynamics of cosmic superstrings.

Collection/Series:
Scientific Areas:

## On the 2-vector re-formulation of quantum mechanics

Wednesday Sep 30, 2009
Speaker(s):

I will discuss properties of pre- and post-selected ensembles in quantum mechanics. I will also discuss the proper way to observe these properties through the use of a new type of non-disturbing measurement which I call 'weak measurement'. A number of these new experiments have already been successfully performed and others are in the planning stage. These experiments have confirmed the unique property of pre- and post-selected ensembles that I call 'weak values.' Theoretical analysis of the outcomes of these experiments have produced several very rich results.

Scientific Areas:

## Lessons from black holes -- Equations of motion, scales &amp;amp; effective coupling of quantum gravity

Wednesday Sep 30, 2009
Speaker(s):

We use black holes to understand some basic properties of theories of quantum gravity. First, we apply ideas from black hole physics to the physics of accelerated observers to show that the equations of motion of generalized theories of gravity are equivalent to the thermodynamic relation $\delta Q = T \delta S$. Our proof relies on extending previous arguments by using a more general definition of the Noether charge entropy. We have thus completed the implementation of Jacobson's proposal to express Einstein's equations as a thermodynamic equation of state.

Collection/Series:
Scientific Areas:

## The nature of the wave function in de Broglie's pilot-wave theory

Wednesday Sep 30, 2009
Speaker(s):

TBA

Scientific Areas:

## Statistical Mechanics (PHYS 602) - Lecture 3

Wednesday Sep 30, 2009
Speaker(s):

## Reality and the Role of the Wave Function in Quantum Mechanics

Wednesday Sep 30, 2009
Speaker(s):

The most puzzling issue in the foundations of quantum mechanics is perhaps that of the status of the wave function of a system in a quantum universe. Is the wave function objective or subjective? Does it represent the physical state of the system or merely our information about the system? And if the former, does it provide a complete description of the system or only a partial description?

Scientific Areas:

## Quantum Field Theory (PHYS 601) - Lecture 3

Wednesday Sep 30, 2009
Speaker(s):

## Next Public Lecture

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## RECENT PUBLIC LECTURE

### Mario Livio: Brilliant Blunders

Speaker: Mario Livio