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Dynamical Origin of the Entropy of a Black Hole

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arxiv gr-qc/9309001 v2 pith:CXHFRNAA submitted 1993-09-02 gr-qc

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keywords entropyblackdefinitiondynamicalholehorizonmodesproposed
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Modes of physical fields which are located inside a horizon and which cannot be observed by a distant observer are identified with dynamical degrees of freedom of a black hole. A new invariant statistical mechanical definition of a black-hole's entropy is proposed. It is shown that the main contribution to the entropy is given by thermally excited `invisible' modes propagating in the close vicinity of the horizon. A calculation based on the proposed definition yields a value of the entropy which is in good agreement with the usually adopted value.

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