Does the Fine Structure Constant Really Vary in Time?

Details Does the Fine Structure Constant Really Vary in Time? Does the Fine Structure Constant Really Vary in Time?

1998-08-25

arxiv.org/abs/astro-ph/9808291v1

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures, ApJL in press

Scientific paper

10.1086/311664

We discuss how laboratory experiments can be used to place constraints on possible variations of the fine structure constant alpha in the observationally relevant redshift interval z ~= 0 - 5, within a rather general theoretical framework. We find a worst case upper limit for Delta alpha / alpha of 8 x 10^-6 for z <= 5 and Delta alpha / alpha of 0.9 x 10^-6 for z <= 1.6. The derived limits are at variance with the recent findings by Webb et al. (1998), who claim an observed variation of Delta alpha/alpha = -2.6 +- 0.4 x 10^-5 at 1

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