On the Smoothness of the Horizons of Multi-Black Hole Solutions

Details On the Smoothness of the Horizons of Multi-Black Hole Solutions On the Smoothness of the Horizons of Multi-Black Hole Solutions

1995-02-24

arxiv.org/abs/hep-th/9502146v1

Phys.Rev. D52 (1995) 985-991

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, harvmac, no figures.

Scientific paper

10.1103/PhysRevD.52.985

In a recent paper it was suggested that some multi-black hole solutions in five or more dimensions have horizons that are not smooth. These black hole configurations are solutions to $d$-dimensional Einstein gravity (with no dilaton) and are extremally charged with a magnetic type $(d-2)$-form. In this work these solutions will be investigated further. It will be shown that although the curvature is bounded as the horizon of one of the black holes is approached, some derivatives of the curvature are not. This shows that the metric is not $C^{\infty },$ but rather it is only $C^k$ with $k$ finite. These solutions are static so their lack of smoothness cannot be attributed to the presence of radiation.

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