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. 

  

 

Friday Feb 03, 2012
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Thursday Feb 02, 2012
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Thursday Feb 02, 2012
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Wednesday Feb 01, 2012
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How do snowflakes form?  What creates their complex, symmetrical and strikingly beautiful shapes?  Is it true that no two are exactly alike?  Kenneth Libbrecht of Caltech, will reveal the secrets of snowflakes and the molecular dynamics of crystal growth through spectacular photographs of these miniature ice sculptures. 

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Wednesday Feb 01, 2012
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We relate the discrete classical phase space of loop gravity to the continuous phase space of general relativity. Our construction shows that the flux variables do not label a unique geometry, but rather a class of gauge-equivalent geometries. We resolve the tension between the loop gravity geometrical interpretation in terms of singular geometry, and the spin foam interpretation in terms of piecewise-flat geometry, showing that both geometries belong to the same equivalence class. We also establish a clear relationship between Regge geometries and the piecewise-flat spin foam geometries.

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