Measuring $α$ in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis

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dc.creatorMartins, C. J. A. P.
dc.creatorMelchiorri, A.
dc.creatorTrotta, R.
dc.creatorBean, R.
dc.creatorRocha, G.
dc.creatorAvelino, P. P.
dc.creatorViana, P. T. P.
dc.date2002-03-10
dc.date2002-05-10
dc.date.accessioned2026-07-07T11:28:53Z
dc.date.available2026-07-07T11:28:53Z
dc.descriptionWe extend our recent work on the effects of a time-varying fine-structure constant $α$ in the cosmic microwave background, by providing a thorough analysis of the degeneracies between $α$ and the other cosmological parameters, and discussing ways to break these with both existing and/or forthcoming data. In particular, we present the state-of-the-art CMB constraints on $α$, through a combined analysis of the BOOMERanG, MAXIMA and DASI datasets. We also present a novel discussion of the constraints on $α$ coming from large-scale structure observations, focusing in particular on the power spectrum from the 2dF survey. Our results are consistent with no variation in $α$ from the epoch of recombination to the present day, and restrict any such (relative) variation to be less than about 4%. We show that the forthcoming MAP and (particularly) Planck experiments will be able to break most of the currently existing degeneracies between $α$ and other parameters, and measure $α$ to better than percent accuracy.
dc.description11 pages in RevTex4 format. Low-quality figures to comply with arXiv restrictions (better ones available from the authors). v2: Updated Oklo discussion, plus other cosmetic changes. Version to appear in Phys Rev D
dc.identifierhttps://arxiv.org/abs/astro-ph/0203149
dc.identifierhttp://arxiv.org/abs/astro-ph/0203149
dc.identifierPhys.Rev.D66:023505,2002
dc.identifierdoi:10.1103/PhysRevD.66.023505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196540
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleMeasuring $α$ in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis
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