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Cosmology: Black holes constrain varying constants

Davies, P C W; Davis, Tamara M; Lineweaver, Charles


There is evidence to suggest that the finestructure constant, a - a measure of the strength of the electromagnetic interaction between photons and electrons, is slowly increasing over cosmological timescales. As a=e2 /hc (where e is the electronic charge, h 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,...[Show more]

CollectionsANU Research Publications
Date published: 2002
Type: Journal article
Source: Nature
DOI: 10.1038/418602a


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