Constraints on time variation of fine structure constant from WMAP-3yr data

Details Constraints on time variation of fine structure constant from WMAP-3yr data Constraints on time variation of fine structure constant from WMAP-3yr data

2007-07-02

arxiv.org/abs/0707.0190v1

NewAstron.12:635-640,2007

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures; accepted for publication in New Astronomy, June 02 2007

Scientific paper

10.1016/j.newast.2007.06.004

This paper presents the constraints on the time variation of the fine structure constant at recombination relative to its present value, Delta_alpha = (alpha_rec-alpha_0) / alpha_0, obtained from the analysis of the WMAP-3yr Cosmic Microwave Background (CMB) data, with an additional prior on the Hubble expansion rate from HST Hubble Key Project. I found out that -0.039 < Delta_alpha < 0.010 at 95% C.L., which brings a 30% improvement to the previous limits from WMAP-1yr data. The corresponding recombination redshift, 1012 < z_rec < 1115, shows a delayed recombination epoch compared with the results from WMAP-1yr data.

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