Supersymmetric Dyonic Black Holes in Kaluza-Klein Theory

Abstract

We study supersymmetric, four-dimensional (4-d), Abelian charged black holes (BH's) arising in (4+n)-d (1 \le n \le 7) Kaluza-Klein (KK) theories. Such solutions, which satisfy supersymmetric Killing spinor equations (formally satisfied for any n) and saturate the corresponding Bogomol'nyi bounds, can be obtained if and only if the isometry group of the internal space is broken down to the U(1)_E \times U(1)_M gauge group; they correspond to dyonic BH's with electric Q and magnetic P charges associated with {\it different} U(1) factors. The internal metric of such configurations is diagonal with (n-2) internal radii constant, while the remaining two radii (associated with the respective electric and magnetic U(1) gauge fields) and the 4-d part of the metric turn out to be independent of n, i.e., solutions are effectively those of supersymmetric 4-d BH's of 6-d KK theory. For Q \ne 0 and P \ne 0, 4-d space-time has a null singularity, finite temperature (T_H \propto 1 / \sqrt{|QP|}) and zero entropy. Special cases with either Q=0 or P=0 correspond to the supersymmetric 4-d BH's of 5-d KK theory, first derived by Gibbons and Perry, which have a naked singularity and infinite temperature.

36 pages TEX (1 Postscript figure available via anonymous ftp to dept.physics.upenn.edu:/pub/UPR-623-T), UPR-623-T

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