Cosmology: Black holes constrain varying constants

Details Cosmology: Black holes constrain varying constants Cosmology: Black holes constrain varying constants

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002natur.418..602d&link_type=abstract

Nature, Volume 418, Issue 6898, pp. 602-603 (2002).

Mathematics

Logic

28

Scientific paper

There is evidence to suggest that the fine-structure constant, α - a measure of the strength of the electromagnetic interaction between photons and electrons - is slowly increasing over cosmological timescales. As α = e2/ℏc (where e is the electronic charge, ℏ is Planck's constant and c is the speed of light), this would call into question which of these fundamental quantities are truly constant. Here we consider black-hole thermodynamics as a test of which constants might actually be variable, discounting those that could lead to a violation of the generalized second law of thermodynamics.

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