We present a summary of recent constraints on the value of the fine-structure constant at the epoch of decoupling from the recent observations made by the Wilkinson microwave anisotropy probe (WMAP) satellite. Within the set of models considered, a variation of the value of α at decoupling with respect to the present-day value is now bounded to be smaller than 2% (6%) at 95% confidence level. We point out that the existence of an early reionization epoch as suggested by the above measurements will, when more accurate cosmic microwave background polarization data are available, lead to considerably tighter constraints. We find that the tightest possible constraint on α is about 0.1% using CMB data alone - tighter constraints will require further (non-CMB) priors. © 2003 Elsevier B.V. All rights reserved.

New constraints on varying α / Rocha, G.; Trotta, R.; Martins, C. J. A. P.; Melchiorri, A.; Avelino, P. P.; Viana, P. T. P.. - In: NEW ASTRONOMY REVIEWS. - ISSN 1387-6473. - 47:8(2003), pp. 863-869. ((Intervento presentato al convegno 2nd CMBNet Workshop on Science and Parameter Extraction tenutosi a OXFORD, ENGLAND nel FEB 20-21, 2003 [10.1016/j.newar.2003.07.018].

New constraints on varying α

Trotta R.;
2003

Abstract

We present a summary of recent constraints on the value of the fine-structure constant at the epoch of decoupling from the recent observations made by the Wilkinson microwave anisotropy probe (WMAP) satellite. Within the set of models considered, a variation of the value of α at decoupling with respect to the present-day value is now bounded to be smaller than 2% (6%) at 95% confidence level. We point out that the existence of an early reionization epoch as suggested by the above measurements will, when more accurate cosmic microwave background polarization data are available, lead to considerably tighter constraints. We find that the tightest possible constraint on α is about 0.1% using CMB data alone - tighter constraints will require further (non-CMB) priors. © 2003 Elsevier B.V. All rights reserved.
New Astronomy Reviews
47
8
863
869
https://arxiv.org/abs/astro-ph/0405630
Rocha, G.; Trotta, R.; Martins, C. J. A. P.; Melchiorri, A.; Avelino, P. P.; Viana, P. T. P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/116893
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