Varying alpha and black hole entropy
arXiv:hep-th/0212105 · doi:10.1088/1126-6708/2003/02/005
Abstract
Recently it has been suggested that an increase in the fine structure constant alpha with time would decrease the entropy of a Reissner-Nordstrom black hole, thereby violating the second law of thermodynamics. In this note we point out that, at least for a certain class of charged dilaton black holes related to string theory, the entropy does not change under adiabatic variations of alpha and one might expect it to increase for non-adiabatic changes.
arXiv comment5 pages, matches version accepted in JHEP
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