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

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dc.creatorAvelino, P. P.
dc.creatorEsposito, S.
dc.creatorMangano, G.
dc.creatorMartins, C. J. A. P.
dc.creatorMelchiorri, A.
dc.creatorMiele, G.
dc.creatorPisanti, O.
dc.creatorRocha, G.
dc.creatorViana, P. T. P.
dc.date2001-02-08
dc.date2001-06-18
dc.date.accessioned2026-07-07T11:28:45Z
dc.date.available2026-07-07T11:28:45Z
dc.descriptionHigher-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.
dc.description5 pages, 1 figure, minor misprints corrected, references added. The analysis has been updated using new BOOMERanG and DASI data on CMB anisotropy
dc.identifierhttps://arxiv.org/abs/astro-ph/0102144
dc.identifierhttp://arxiv.org/abs/astro-ph/0102144
dc.identifierPhys.Rev.D64:103505,2001
dc.identifierdoi:10.1103/PhysRevD.64.103505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196496
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleEarly-universe constraints on a time-varying fine structure constant
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