Apparent shape of super-spinning black holes

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dc.creatorBambi, Cosimo
dc.creatorFreese, Katherine
dc.date2008-12-07
dc.date2009-02-03
dc.date.accessioned2026-07-07T12:38:07Z
dc.date.available2026-07-07T12:38:07Z
dc.descriptionWe consider the possibility that astrophysical Black Holes (BHs) can violate the Kerr bound; i.e., they can have angular momentum greater than BH mass, $J > M$. We discuss implications on the BH apparent shape. Even if the bound is violated by a small amount, the shadow cast by the BH changes significantly (it is $\sim$ an order of magnitude smaller) from the case with $J \le M$ and can be used as a clear observational signature in the search for super--spinning BHs. We discuss briefly recent observations in the mm range of the super--massive BH at the Center of the Galaxy, speculating on the possibility that it might violate the Kerr bound.
dc.description7 pages, 3 figures. v3: refereed version
dc.identifierhttps://arxiv.org/abs/0812.1328
dc.identifierhttp://arxiv.org/abs/0812.1328
dc.identifierPhys.Rev.D79:043002,2009
dc.identifierdoi:10.1103/PhysRevD.79.043002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218642
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleApparent shape of super-spinning black holes
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