2007/03/31 by Steven B. Giddings · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Black hole (networking) #Black hole thermodynamics #Classical mechanics #Cosmology and Gravitation Theories #Coupling (piping) #Gravitation #Gravitational field #Micro black hole #Noncommutative and Quantum Gravity Theories #Physics #Planck #Planck mass #Quantization (signal processing) #Quantum #Quantum dynamics #Quantum electrodynamics #Quantum fluctuation #Quantum gravity #Quantum mechanics #Quantum process #Semiclassical gravity #Semiclassical physics #Spacetime #Virtual black hole #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.76.064027
published as Phys.Rev.D76:064027,2007 · 28 pages, 4 figures, harvmac. v2: added refs, minor clarifications
arxiv created 2007/04/04 · openalex publication_date 2007/09/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 M3. Lack of a systematic derivation of the weakly coupled/semiclassical approximation would indicate a role for the nonperturbative dynamics of gravity, and possibly for the proposal that such dynamics has an essentially nonlocal quality.