Black hole hair removal

Banerjee, Nabamita ; Mandal, Ipsita ; Sen, Ashoke (2009) Black hole hair removal Journal of High Energy Physics, 2009 (9). No pp. given. ISSN 1126-6708

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Macroscopic entropy of an extremal black hole is expected to be determined completely by its near horizon geometry. Thus two black holes with identical near horizon geometries should have identical macroscopic entropy, and the expected equality between macroscopic and microscopic entropies will then imply that they have identical degeneracies of microstates. An apparent counterexample is provided by the 4D-5D lift relating BMPV black hole to a four dimensional black hole. The two black holes have identical near horizon geometries but different microscopic spectrum. We suggest that this discrepancy can be accounted for by black hole hair-degrees of freedom living outside the horizon and contributing to the degeneracies. We identify these degrees of freedom for both the four and the five dimensional black holes and show that after their contributions are removed from the microscopic degeneracies of the respective systems, the result for the four and five dimensional black holes match exactly.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
Keywords:p-branes; Black Holes in String Theory
ID Code:43974
Deposited On:20 Jun 2011 05:22
Last Modified:18 May 2016 00:47

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