克尔黑洞不是广义相对论所独有的
Kerr Black Holes are Not Unique to General Relativity
摘要：
最近相当多的注意力集中在通过扩展广义相对论而获得的引力理论上，增加了标量、矢量或张量自由度。在本文中，我们表明，这些理论的黑洞解本质上是无法区分的广义相对论。因此，我们的结论是，一个潜在的观测验证克尔度规周围的天体物理黑洞本身不能被用来区分这些理论。另一方面，探测到克尔度规的偏差将意味着我们对引力物理学的理解需要发生重大变化，这一点仍然是正确的。
英文摘要：
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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