A Higher Dimensional Stationary Rotating Black Hole Must be Axisymmetric

Details A Higher Dimensional Stationary Rotating Black Hole Must be Axisymmetric A Higher Dimensional Stationary Rotating Black Hole Must be Axisymmetric

2006-05-19

arxiv.org/abs/gr-qc/0605106v3

Commun.Math.Phys.271:699-722,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

24 pages, no figures, v2: footnotes and references added, v3: numerous minor revisions

Scientific paper

10.1007/s00220-007-0216-4

A key result in the proof of black hole uniqueness in 4-dimensions is that a stationary black hole that is ``rotating''--i.e., is such that the stationary Killing field is not everywhere normal to the horizon--must be axisymmetric. The proof of this result in 4-dimensions relies on the fact that the orbits of the stationary Killing field on the horizon have the property that they must return to the same null geodesic generator of the horizon after a certain period, $P$. This latter property follows, in turn, from the fact that the cross-sections of the horizon are two-dimensional spheres. However, in spacetimes of dimension greater than 4, it is no longer true that the orbits of the stationary Killing field on the horizon must return to the same null geodesic generator. In this paper, we prove that, nevertheless, a higher dimensional stationary black hole that is rotating must be axisymmetric. No assumptions are made concerning the topology of the horizon cross-sections other than that they are compact. However, we assume that the horizon is non-degenerate and, as in the 4-dimensional proof, that the spacetime is analytic.

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