Measuring α in the Early Universe

Details Measuring α in the Early Universe Measuring α in the Early Universe

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ap%26ss.283..589r&link_type=abstract

Astrophysics and Space Science, v. 283, Issue 4, p. 589-594 (2003).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We update the bounds on a time-varying fine structure constant \alpha at the time of BBN (z~1010) and CMB (z~103) and present the current CMB constraints on α, through a combined analysis of the BOOMERanG, MAXIMA and DASI datasets. We also present a discussion of the constraints on α coming from large-scale structure observations, focusing in particular on the power spectrum from the 2dF survey. Finally we provide a analysis of the degeneracies between α and the other cosmological parameters and discuss ways to break these with both existing and/or forthcoming data. Our results are consistent with no variation in α from the epoch of recombination to the present day, and restrict any such variation to be less than about 4%. We show that the forthcoming MAP and 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.

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