Primordial nucleosynthesis in the Brans-Dicke theory with a variable cosmological term

Details Primordial nucleosynthesis in the Brans-Dicke theory with a variable cosmological term Primordial nucleosynthesis in the Brans-Dicke theory with a variable cosmological term

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179...17a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 17-22.

Astronomy and Astrophysics

Astrophysics

24

Abundance, Cosmology, Gravitational Constant, Light Elements, Nuclear Fusion

Scientific paper

Primordial abundances of light elements are calculated in the framework of the Brans-Dicke universe modified with a variable cosmological term, which is a function of the scalar field φ. Constraints on the parameters which appear in the modified Brans-Dicke cosmology are derived from comparisons with the observed abundances. The abundances of 2H, 3He and 7Li yield the bounds on the present matter density, while the 4He abundance primarily restricts the rate of change in φ. From these considerations, a model that has negative φin the early universe and, therefore, that has increasing gravitational "constant" G with time during the era of nucleosynthesis is proposed to be reasonable.

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