Black Hole Entropy and Physics at Planckian Scales

Details Black Hole Entropy and Physics at Planckian Scales Black Hole Entropy and Physics at Planckian Scales

1995-10-21

arxiv.org/abs/hep-th/9510156v3

Physics

High Energy Physics

High Energy Physics - Theory

21 pages, latex, 5 Postscript figures, Contribution to the Proceedings of the School "String Gravity and the Planck Energy Sca

Scientific paper

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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