Article

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

09/2005; DOI:doi:10.1051/0004-6361:20042618
Source: arXiv

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 $^4$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. Comment: Submitted to A&A, 5 pages, 7 figures

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### Keywords

7 figures

big-bang nucleosynthesis

cosmic expansion rate

Li

likelihood analysis

nuclear reaction rates

observed ones

produced abundances

standard model

value deduced

varying $\Lambda$ term