Decoherence with energy conservation

Bill Unruh (UBC)
Event Date and Time: 
Thu, 2012-03-08 12:00 - 13:30
Hennings 318
Intended Audience: 

In the 80's Banks, Peskin and Susskind argued that black hole
information loss of necessity implied energy non-conservation in the process
of black hole evaporation. This result was refered to by Giddings in his
colloquium a few weeks ago. Since this would be expected also to apply to
planck scale black holes ( or even virtual black holes of smaller size) this
might imply a constant stream of energy non-conservation. They based this on
simple models of decoherence. I will give a simple collision model of two
particles in which decoherence takes place, but energy is exactly conserved by
the two particles before and after the collision. This model is closely
related to the "spin bath" model of Stamp.

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