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Physical Review D 80 (2009) 87302
New constraints on variations of the fine structure constant from CMB anisotropies
E. Menegoni1, S. Galli1, 2, J.G. Bartlett2, C.J.A.P. Martins3, A. Melchiorri1

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 α/α0=0.987±0.012 at 68% C.L. The inclusion of the new Hubble Space Telescope constraints on the Hubble constant further increases the accuracy to α/α0=1.001±0.007 at 68% C.L., bringing possible deviations from the current value below the 1% level and improving previous constraints by a factor of ˜3.
1 :  Università degli Studi di Roma "La Sapienza" [Rome]
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  DAMTP/CMS - Department of Applied Mathematics and Theoretical Physics / Centre for Mathematical Sciences
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Particle-theory and field-theory models of the early Universe – Determination of fundamental constants – Background radiations
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