Big bang nucleosynthesis constraints on scalar-tensor theories of gravity

Details Big bang nucleosynthesis constraints on scalar-tensor theories of gravity Big bang nucleosynthesis constraints on scalar-tensor theories of gravity

2006-01-13

arxiv.org/abs/astro-ph/0601299v1

Phys.Rev.D73:083525,2006

Astronomy and Astrophysics

Astrophysics

19 pages, 30 eps figures

Scientific paper

10.1103/PhysRevD.73.083525

We investigate BBN in scalar-tensor theories of gravity with arbitrary matter couplings and self-interaction potentials. We first consider the case of a massless dilaton with a quadratic coupling to matter. We perform a full numerical integration of the evolution of the scalar field and compute the resulting light element abundances. We demonstrate in detail the importance of particle mass thresholds on the evolution of the scalar field in a radiation dominated universe. We also consider the simplest extension of this model including a cosmological constant in either the Jordan or Einstein frame.

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