# 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.

## Indexed Degeneracies of BPS States and Topological Strings

Tuesday Nov 15, 2005
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## Entanglement-assisted invariance, ignorance, and information in quantum physics

Wednesday Nov 09, 2005
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I shall discuss entanglement - assisted invariance (symmetry exhibited by correlated quantum states) and describe how it can be used to understand the nature of ignorance, and, hence, the origin of probabilities in quantum physics. WHZ, Phys. Rev. Lett. 90, 120404 (2003); Rev. Mod. Phys. 75, 715 (2003); Phys. Rev. 71, 052105 (2005) (quant-ph/0405161).

## The Big Bang

Wednesday Nov 02, 2005

Simon Singh grew up in Somerset, and completed his undergraduate work at Imperial College London, and his Ph.D. at Cambridge University and CERN. He has worked with the BBCs Science Department since 1990. In 1996, Singh directed the award-winning documentary Fermats Last Theorem. The documentary was also nominated for an Emmy under the American title The Proof. He is the author of three books, most recently, the Big Bang, a history of cosmology.

## Acceleration of highest energy cosmic rays

Tuesday Nov 01, 2005
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Highest energy cosmic rays reach {\it macroscopic} energies $> 10^{20}$ eV ($\sim 10$ joules; corresponding linear momentum in one proton is similar to a slapshot hockey puck's). Such protons can either be accelerated by nearby astrophysical sources or be by-products of decay of unknown superheavy fundamental particles. After reviewing phenomenology of cosmic rays, I will discuss a novel {\it non-stochastic} acceleration mechanism in jets of powerful active galactic nuclei. The mystery of ultra high energy cosmic rays is likely soon to be resolved by Pierre Auger observatory.

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## Microstates for BPS black holes and black rings

Tuesday Nov 01, 2005
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## Quanta, Ciphers and Computers

Sunday Oct 23, 2005
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Artur Ekert, quanta, cipher, computers, secure communication, cryptography, permutations, substitution, quantum, spooky action, entanglement, Schrodinger, quantum theory

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## Following In The Footsteps: Searching For The Next Miracle

Sunday Oct 23, 2005

Howard Burton, John Stachel, Artur Ekert, Gary Horowitz, unifying, quantum field theory, superstring theory, unification, symmetry of nature, electromagnetism, gravity, Einstein, quantum, many worlds, quantum mechanics, Higgs particle,supersymmetry, quantum computers

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## Meet the \'Other\' Einstein

Sunday Oct 23, 2005
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It is well known that Einstein worked to develop a unified field theory that would encompass all of physics including (he hoped) all quantum phenomena. It is not so well known that there was \'another Einstein,\' who from 1916 on was skeptical about the continuum as a foundational element in physics, especially because of the existence of quantum phenomena.

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## Faster than the Speed of Light: Could the Laws of Physics Change?

Saturday Oct 22, 2005
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Could the laws of physics change? The laws of physics are usually meant to be set in stone; variability is not usually part of physics. Yet contradicting Einstein\'s tenet of the constancy of the speed of light raises nothing less than that possibility. I will discuss some of the more dramatic implications of a varying speed of light.

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## First Principles - Building an Einstein Factory

Saturday Oct 22, 2005
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Howard Burton, the Executive Director and chief architect of Perimeter Institute, describes the process and pitfalls of constructing a home for budding Einsteins from scratch in Waterloo. Einstein factory, Howard Burton, Perimeter Institute, Einstein, sociological factors, Mike Lazardis, IAS, research, culture, making a difference, government support,

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## RECENT PUBLIC LECTURE

### From the Mathematics of Supersymmetry to the Music of Arnold Schoenberg

Speaker: S. James Gates Jr.