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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. 

 

Thermodynamics of spacetime

Wednesday Sep 06, 2006
Speaker(s): 
Ted Jacobson
(Flash Presentation, MP3, Windows Presentation,Windows Video File,PDF)

I will first argue that the notion of black hole entropy extends universally to causal horizons. Then I will deduce the causal dynamics of spacetime from the equilibrium thermodynamics of causal horizons. Specifically, it will be shown how the Clausius relation dS = dQ/T between entropy change, energy flux, and acceleration temperature for all local causal horizons implies the Einstein equation, with Newton's constant determined by the universal horizon entropy density. Implications, non-equilibrium processes, and relations to AdS/CFT duality will also be discussed.

Collection/Series: 
Colloquium
Scientific Areas: 
Quantum Gravity

 

Impossible Crystals

Wednesday Sep 06, 2006
Speaker(s): 
Paul Steinhardt
(Flash Presentation, MP3, Windows Presentation,Windows Video File,PDF)

This is a story of how the impossible became possible. How, for centuries, scientists were absolutely sure that solids (as well as decorative patterns like tiling and quilts) could only have certain symmetries - such as square, hexagonal and triangular - and that most symmetries, including five-fold symmetry in the plane and icosahedral symmetry in three dimensions (the symmetry of a soccer ball), were strictly forbidden.

Collection/Series: 
Perimeter Institute Public Lecture Series

 

New separations in quantum communication complexity

Wednesday Aug 30, 2006
Speaker(s): 
Julia Kempe
(MP3, Windows Presentation,Windows Video File,PDF)

In this talk I will present several new results from joint work with Dmitry Gavinsky, Oded Regev and Ronald de Wolf, relating to the model of one-way communication and the simultaneous model of communication. I will describe several separations between various resources (entanglement versus event coin, quantum communication versus classical communication), showing in particular that quantum communication cannot simulate a public coin and that entanglement can be much more powerful than a public coin, even if communication is quantum.

Collection/Series: 
Perimeter Institute Quantum Discussions
Scientific Areas: 
Quantum Information

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