paper

Macroscopic Entropy of Extremal Black Holes

arXiv:hep-th/9602111 · doi:10.1016/0370-2693(96)00711-3

Abstract

Extremal BPS-saturated black holes in , supergravity can carry electric and magnetic charges . It is shown that in smooth cases the moduli fields at the horizon take a fixed "rational" value which is determined by the charges and is independent of the asymptotic values of the moduli fields. A universal formula for the Bekenstein-Hawking entropy is derived in terms of the charges and the moduli space geometry at . This work extends previous results of Ferrara, Kallosh and the author for the pure magnetic case.

Reference corrected, 8 pages, Latex

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