Constants and Variations: From Alpha to Omega

Author: Barrow J.D.

Source: Astrophysics and Space Science, Volume 283, Number 4, 2003 , pp. 645-660(16)

Publisher: Springer

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Abstract:

We review some of the history and properties of theories for the variation of the gravitation and fine structure `constants'. We highlight some general features of the cosmological models that exist in these theories with reference to recent quasar data that is consistent with time-variation in alpha since a redshift of 3.5. The behaviour of a simple class of varying-alpha cosmologies is outlined in the light of all the observational constraints. We discuss the key role played by non-zero vacuum energy and curvature in turning off the variation of constants in these theories and the issue of comparing extra-galactic and local observational data. We also show why black hole thermodynamics does not enable us to distinguish between time variations of different constants.

Language: English

Document Type: Research article

Affiliations: 1: DAMTP, Centre for Mathematical Sciences, Cambridge University, Wilberforce Road, Cambridge CB3 0WA, UK

Publication date: 2003-01-01