Early-universe constraints on a time-varying fine structure constant

Details Early-universe constraints on a time-varying fine structure constant Early-universe constraints on a time-varying fine structure constant

2001-02-08

arxiv.org/abs/astro-ph/0102144v4

Phys.Rev.D64:103505,2001

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, minor misprints corrected, references added. The analysis has been updated using new BOOMERanG and DASI dat

Scientific paper

10.1103/PhysRevD.64.103505

Higher-dimensional theories have the remarkable feature of predicting a time (and hence redshift) dependence of the `fundamental' four dimensional constants on cosmological timescales. In this paper we update the bounds on a possible variation of the fine structure constant alpha at the time of BBN (z =10^10) and CMB (z=10^3). Using the recently-released high-resolution CMB anisotropy data and the latest estimates of primordial abundances of 4He and D, we do not find evidence for a varying alpha at more than one-sigma level at either epoch.

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