Varying alpha and black hole entropy
High Energy Physics - Theory
2009-11-07 v2 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.hep-th/0212105,
title = {Varying alpha and black hole entropy},
author = {Malcolm Fairbairn and Michel H. G. Tytgat},
journal= {arXiv preprint arXiv:hep-th/0212105},
year = {2009}
}
Comments
5 pages, matches version accepted in JHEP