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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 | | Affiliation: | CAUP, 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 | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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