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Issue A&A
Volume 448, Number 1, March II 2006
Page(s) 23 - 27
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20042618



A&A 448, 23-27 (2006)
DOI: 10.1051/0004-6361:20042618

Big-bang nucleosynthesis in a Brans-Dicke cosmology with a varying $\mathsf{\Lambda}$ term related to WMAP

R. Nakamura1, M. Hashimoto1, S. Gamow1 and K. Arai2

1  Department of Physics, Kyushu University, Fukuoka, 810-8560, Japan
2  Department of Physics, Kumamoto University, Kumamoto, 860-8555, Japan

(Received 28 December 2004 / Accepted 11 October 2005 )

Abstract
We investigate the big-bang nucleosynthesis in a Brans-Dicke model with a varying $\Lambda$ term using the Monte-Carlo method and likelihood analysis. It is found that the cosmic expansion rate differs appreciably from that of the standard model. The produced abundances of 4He, D, and 7Li are consistent with the observed ones within the uncertainties in nuclear reaction rates when the baryon to photon ratio $\eta = \left( 5.47{-}6.64 \right)$ $\times$ 10-10, which is in agreement with the value deduced from WMAP.


Key words: nuclear reactions, nucleosynthesis, abundances -- cosmology: early Universe -- cosmology: cosmic microwave background




© ESO 2006


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