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

R. Nakamura; M. Hashimoto; S. Gamow; K. Arai

doi:10.1051/0004-6361:20042618

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

R. Nakamura, M. Hashimoto, S. Gamow, K. Arai

Experimental Particle Physics

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We investigate the big-bang nucleosynthesis in a Brans-Dicke model with a varying A 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 η = (5.47-6.64) × 10 ^-10, which is in agreement with the value deduced from WMAP.

Original language	English
Pages (from-to)	23-27
Number of pages	5
Journal	Astronomy and Astrophysics
Volume	448
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361:20042618
Publication status	Published - Mar 2006

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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AB - We investigate the big-bang nucleosynthesis in a Brans-Dicke model with a varying A 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 η = (5.47-6.64) × 10 -10, which is in agreement with the value deduced from WMAP.

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

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