August 4th-7th, 2014
Yukawa Institute for Theoretical Physics, Kyoto University
"Firewalls: A General Relativistic perspective" (including 30min. introduction to general relativity)
William G. Unruh (Univ. of British Columbia)
Firewalls have been a recent puzzle in the understanding of black hole evaporation. If one demands that the evaporation of the black hole is "unitary" (by which is meant that the state outside the black hole after the evaporation of the hole, is unitarily related to the state that originally formed the black hole) then quantum mechanics implies that there is a large (infinite) stress energy tensor lying just along the horizon, the firewall. I will demonstrate this energy due to breaking the coherence of the vacuum by a simple example, and outline three possible attitudes toward the firewall- acceptance, rejection by loss of information, and rejection because quantum gravity may imply no horizon forms.
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