Can Black Hole Relax Unitarily?

Details Can Black Hole Relax Unitarily? Can Black Hole Relax Unitarily?

2004-06-15

arxiv.org/abs/hep-th/0406130v2

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, Based on talks given at ``Black Holes IV'', Honey Harbour, June 2003 and at BW2003, Vrnjacka Banja, August 2003

Scientific paper

We review the way the BTZ black hole relaxes back to thermal equilibrium after a small perturbation and how it is seen in the boundary (finite volume) CFT. The unitarity requires the relaxation to be quasi-periodic. It is preserved in the CFT but is not obvious in the case of the semiclassical black hole the relaxation of which is driven by complex quasi-normal modes. We discuss two ways of modifying the semiclassical black hole geometry to maintain unitarity: the (fractal) brick wall and the worm-hole modification. In the latter case the entropy comes out correctly as well.

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