Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-09-19
Phys.Rev.D80:087302,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
3 pages, 2 figures
Scientific paper
10.1103/PhysRevD.80.087302
We demonstrate that recent measurements of Cosmic Microwave Background temperature and polarization anisotropy made by the ACBAR, QUAD and BICEP experiments substantially improve the cosmological constraints on possible variations of the fine structure constant in the early universe. This data, combined with the five year observations from the WMAP mission yield the constraint alpha/alpha_0 = 0.987 \pm 0.012 at 68% c.l.. The inclusion of the new HST constraints on the Hubble constant further increases the accuracy to alpha/alpha_0 = 1.001 \pm 0.007 at 68% c.l., bringing possible deviations from the current value below the 1% level and improving previous constraints by a factor 3.
Bartlett James
Galli Silvia
Martins Carlos J. A. P.
Melchiorri Alessandro
Menegoni Eloisa
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