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On the topology of stationary black holes

P. T. Chrusciel, R. M. Wald

gr-qcarXiv:gr-qc/9410004

Abstract

We prove that the domain of outer communication of a stationary, globally hyperbolic spacetime satisfying the null energy condition must be simply connected. Under suitable additional hypotheses, this implies, in particular, that each connected component of a cross-section of the event horizon of a stationary black hole must have spherical topology.

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