Quantization in black hole backgrounds

Details Quantization in black hole backgrounds Quantization in black hole backgrounds

2007-03-13

arxiv.org/abs/hep-th/0703116v2

Phys.Rev.D76:064027,2007

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, 4 figures, harvmac. v2: added refs, minor clarifications

Scientific paper

10.1103/PhysRevD.76.064027

Quantum field theory in a semiclassical background can be derived as an approximation to quantum gravity from a weak-coupling expansion in the inverse Planck mass. Such an expansion is studied for evolution on "nice-slices" in the spacetime describing a black hole of mass M. Arguments for a breakdown of this expansion are presented, due to significant gravitational coupling between fluctuations, which is consistent with the statement that existing calculations of information loss in black holes are not reliable. For a given fluctuation, the coupling to subsequent fluctuations becomes of order unity by a time of order M^3. Lack of a systematic derivation of the weakly-coupled/semiclassical approximation would indicate a role for the non-perturbative dynamics of gravity, and possibly for the proposal that such dynamics has an essentially non-local quality.

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