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Black Hole Entropy and Physics at Planckian Scales

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arxiv hep-th/9510156 v3 pith:A44LVKQ3 submitted 1995-10-21 hep-th gr-qc

classification hep-thgr-qc
keywords entropyblackholediscussrelationcalculationschangecoincide
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We discuss and compare different definitions of the entropy of a black hole. In particular we show that the thermodynamical entropy defined by the response of the free energy of a black hole to the change of temperature does not coincide with the statistical-mechanical entropy, obtained by counting its dynamical degrees of freedom. The no-boundary wavefunction of a black hole, its relation to the entropy problem and its generalization are discussed. We discuss the relation between on-shell and off-shell calculations of the entropy, and the role of the renormalization of the gravitational constant.

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    With subleading-corrected Faddeev-Kulish dressing, tree-level QED bremsstrahlung below the dressing scale vanishes, and elastic dressed amplitudes equal the infrared-finite part of Fock amplitudes.

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