Black holes may not constrain varying constants

Details Black holes may not constrain varying constants Black holes may not constrain varying constants

2002-09-27

arxiv.org/abs/hep-th/0209249v1

Nature 421:498,2003

Physics

High Energy Physics

High Energy Physics - Theory

1+3 pages LaTex, 1 figure

Scientific paper

10.1038/421498a

New and rather controversial observations hint that the fine structure constant \alpha may have been smaller in the early universe, suggesting that some of the fundamental ``constants'' of physics may be dynamical. In a recent paper, Davies, Davis, and Lineweaver have argued that black hole thermodynamics favors theories in which the speed of light c decreases with time, and disfavors those in which the fundamental electric charge e increases. We show that when one considers the full thermal environment of a black hole, no such conclusion can be drawn: thermodynamics is consistent with an increase in \alpha whether it comes from a decrease in c, an increase in e, or a combination of the two.

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