Black Hole Entropy

Details Black Hole Entropy Black Hole Entropy

1994-12-23

arxiv.org/abs/hep-th/9412211v1

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, LaTeX; Talk at the Winnipeg Heat Kernel Conference (Aug,94)

Scientific paper

In the talk different definitions of the black hole entropy are discussed and compared. It is shown that the Bekenstein-Hawking entropy $S^{BH}$ (defined by the response of the free energy of a system containing a black hole on the change of the temperature) differs from the statistical- mechanical entropy $S^{SM}=-\mbox{Tr}(\hat{\rho}\ln \hat{\rho})$ (defined by counting internal degrees of freedom of a black hole). A simple explanation of the universality of the Bekenstein-Hawking entropy (i.e. its independence of the number and properties of the fields which might contribute to $S^{SM}$) is given.

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