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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:08120016  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Why there is no information loss
Speaker(s): Abhay Ashtekar
Abstract: Using 2-dimensional CGHS black holes, I will argue that information is not lost in the Hawking evaporation because the quantum space-time is significantly larger than the classical one. I will begin with a discussion of the conceptual underpinnings of problem and then introduce a general, non-perturbative framework to describe quantum CGHS black holes. I will show that the Hawking effect emerges from it in the first approximation. Finally, I will introduce a mean field approximation to argue that, when the back reaction is included, future null infinity is `long enough' to capture full information contained in pure states at past null infinity and that the S-matrix is unitary. There are no macroscopic remnants.
Date: 04/12/2008 - 11:00 am
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