Kerr Black Holes are Not Unique to General Relativity

Details Kerr Black Holes are Not Unique to General Relativity Kerr Black Holes are Not Unique to General Relativity

2007-10-25

arxiv.org/abs/0710.4564v2

Phys.Rev.Lett.100:091101,2008; Phys.Rev.Lett.100:119902,2008

Astronomy and Astrophysics

Astrophysics

4 pages, Physical Review Letters in press

Scientific paper

10.1103/PhysRevLett.100.091101 1

Considerable attention has recently focused on gravity theories obtained by extending general relativity with additional scalar, vector, or tensor degrees of freedom. In this paper, we show that the black-hole solutions of these theories are essentially indistinguishable from those of general relativity. Thus, we conclude that a potential observational verification of the Kerr metric around an astrophysical black hole cannot, in and of itself, be used to distinguish between these theories. On the other hand, it remains true that detection of deviations from the Kerr metric will signify the need for a major change in our understanding of gravitational physics.

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