Cosmic Evolution in a Modified Brans-Dicke Theory

Details Cosmic Evolution in a Modified Brans-Dicke Theory Cosmic Evolution in a Modified Brans-Dicke Theory

2012-01-09

arxiv.org/abs/1201.1827v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 3 figures, To appear in Astrophysics and Space Science

Scientific paper

We consider Brans-Dicke theory with a self-interacting potential in Einstein conformal frame. We introduce a class of solutions in which an accelerating expansion is possible in a spatially flat universe for positive and large values of the Brans-Dicke parameter consistent with local gravity experiments. In this Einstein frame formulation, the theory appears as an interacting quintessence model in which the interaction term is given by the conformal transformation. In such an interacting model, we shall show that the solutions lead simultaneously to a constant ratio of energy densities of matter and the scalar field.

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