Early-universe constraints on a time-varying fine structure constant - art. no. 103505

Citation
Pr. Avelino et al., Early-universe constraints on a time-varying fine structure constant - art. no. 103505, PHYS REV D, 6410(10), 2001, pp. 3505
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6410
Issue
10
Year of publication
2001
Database
ISI
SICI code
0556-2821(20011115)6410:10<3505:ECOATF>2.0.ZU;2-F
Abstract
Higher-dimensional theories have the remarkable feature of predicting a tim e (and hence redshift) dependence of the "fundamental" four dimensional con stants on cosmological time scales. In this paper, we update the bounds on a possible variation of the fine structure constant a at the time of big ba ng nucleosynthesis (z similar to 10(10)) and cosmic microwave background (C MB) (z similar to 10(3)). Using the recently released high-resolution CMB a nisotropy data and the, latest estimates of primordial abundances of He-4 a nd D, we do not find evidence for a varying alpha at more than a one sigma level at either epoch.