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03 October 2022
 
  » arxiv » astro-ph/0203149

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Measuring $alpha$ in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis
C.J.A.P. Martins ; A. Melchiorri ; R. Trotta ; R. Bean ; G. Rocha ; P.P. Avelino ; P.T.P. Viana ;
Date 10 Mar 2002
Journal Phys.Rev. D66 (2002) 023505
Subject astro-ph gr-qc hep-ph hep-th
AffiliationCAUP, Cambridge, IAP), A. Melchiorri (Oxford), R. Trotta (Geneva), R. Bean (Imperial College), G. Rocha (Cambridge), P.P. Avelino (CAUP) and P.T.P. Viana (CAUP
AbstractWe extend our recent work on the effects of a time-varying fine-structure constant $alpha$ in the cosmic microwave background, by providing a thorough analysis of the degeneracies between $alpha$ 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 $alpha$, through a combined analysis of the BOOMERanG, MAXIMA and DASI datasets. We also present a novel discussion of the constraints on $alpha$ 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 $alpha$ 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 $alpha$ and other parameters, and measure $alpha$ to better than percent accuracy.
Source arXiv, astro-ph/0203149
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