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Title: How fast can a black hole rotate?
Author: Herdeiro, Carlos A. R.
Radu, Eugen
Keywords: Black holes
Angular momentum
Kerr bound
Issue Date: 5-Nov-2015
Publisher: World Scientific Publishing
Abstract: Kerr black holes (BHs) have their angular momentum, J, bounded by their mass, M: Jc <= GM(2). There are, however, known BH solutions violating this Kerr bound. We propose a very simple universal bound on the rotation, rather than on the angular momentum, of four-dimensional, stationary and axisymmetric, asymptotically flat BHs, given in terms of an appropriately defined horizon linear velocity, v(H). The v(H) bound is simply that v(H) cannot exceed the velocity of light. We verify the v(H) bound for known BH solutions, including some that violate the Kerr bound, and conjecture that only extremal Kerr BHs saturate the v(H) bound.
Peer review: yes
DOI: 10.1142/S0218271815440228
ISSN: 0218-2718
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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