Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying $Λ$ term related to WMAP

Details Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying $Λ$ term related to WMAP Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying $Λ$ term related to WMAP

2005-09-05

arxiv.org/abs/astro-ph/0509076v1

Astron.Astrophys.448:23,2006

Astronomy and Astrophysics

Astrophysics

Submitted to A&A, 5 pages, 7 figures

Scientific paper

10.1051/0004-6361:20042618

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 $^4$He, D, and barely Li are consistent with the observed ones within the uncertainties in nuclear reaction rates when the baryon to photon ratio $\eta = (5.47 - 6.64)\times 10^{-10}$, which is in agreement with the value deduced from WMAP.

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