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SUMMARY:Counting the entropy of any causal horizon - Fay Dowker (Imperial)
DTSTART:20120601T120000Z
DTEND:20120601T130000Z
UID:TALK37267@talks.cam.ac.uk
CONTACT:Ian A. Morrison
DESCRIPTION:Jacobson and Parentani argued that the laws of thermodynamics 
 apply universally to all causal horizons in spacetime\, where a causal hor
 izon is the boundary of the causal past of a timelike curve of infinite pr
 oper length in the future direction. I will describe investigations into t
 he microscopic kinematics of the entropy of causal horizons based on a des
 cription of spacetime that is atomic on Planckian scales and in which caus
 al structure is still meaningful. I will describe an atomically defined qu
 antity -- which bears analogy with the "mutual information" -- arising fro
 m the partition of spacetime into two by the causal horizon. The proposal 
 is that this quantity ``accounts for'' the horizon entropy in the same sen
 se that the number of molecules in a gas accounts \nfor the entropy of the
  gas. I will present numerical evidence for the proposal.
LOCATION:Pavilion B Potter Room (B1.19)
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