Entropy of extremal black holes
نویسنده
چکیده
After summarizing the development of black hole thermodynamics in the seventies, we describe a recent microscopic model. This model suggests that the Bekenstein-Hawking area formula holds for extremal black holes as well as for ordinary (non-extremal) ones. On the other hand, semiclassical studies have suggested a discontinuity between non-extremal and extremal cases. We indicate how a reconciliation has been brought about by summing over topologies. Based on Invited Talk at Workshop on Frontiers of Quantum Field Theory, Quantum Gravity and Strings: Puri, December 1996
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