Separability in Cohomogeneity-2 Kerr-NUT-AdS Metrics

Details Separability in Cohomogeneity-2 Kerr-NUT-AdS Metrics Separability in Cohomogeneity-2 Kerr-NUT-AdS Metrics

2006-02-08

arxiv.org/abs/hep-th/0602084v2

JHEP 0604:008,2006

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 15 pages, minor typos corrected

Scientific paper

10.1088/1126-6708/2006/04/008

The remarkable and unexpected separability of the Hamilton-Jacobi and Klein-Gordon equations in the background of a rotating four-dimensional black hole played an important role in the construction of generalisations of the Kerr metric, and in the uncovering of hidden symmetries associated with the existence of Killing tensors. In this paper, we show that the Hamilton-Jacobi and Klein-Gordon equations are separable in Kerr-AdS backgrounds in all dimensions, if one specialises the rotation parameters so that the metrics have cohomogeneity 2. Furthermore, we show that this property of separability extends to the NUT generalisations of these cohomogeneity-2 black holes that we obtained in a recent paper. In all these cases, we also construct the associated irreducible rank-2 Killing tensor whose existence reflects the hidden symmetry that leads to the separability. We also consider some cohomogeneity-1 specialisations of the new Kerr-NUT-AdS metrics, showing how they relate to previous results in the literature.

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