Does the Fine Structure Constant Really Vary in Time?

Abstract

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<z<1.6.

11 pages, 2 figures, ApJL in press

References in corpus (4)

• Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
• Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae
• New Limits on the Possible Variation of Physical Constants
• An updated precision estimate of the Hubble constant and the age and density of the Universe in the decaying neutrino theory

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