Over-spinning a black hole with a test body

Details Over-spinning a black hole with a test body Over-spinning a black hole with a test body

2009-07-23

arxiv.org/abs/0907.4146v2

Phys. Rev. Lett. 103, 141101 (2009); 103, 209903(E) (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages; v2: reference added, incorporates the missed case of an oblate test body, which appears with the published version on

Scientific paper

10.1103/PhysRevLett.103.141101

It has long been known that a maximally spinning black hole can not be over-spun by tossing in a test body. Here we show that if instead the black hole starts out with below maximal spin, then indeed over-spinning can be achieved when adding either orbital or spin angular momentum. We find that requirements on the size and internal structure of the test body can be met as well. Our analysis neglects radiative and self-force effects,which may prevent the over-spinning.

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