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On the Chameleon Brans-Dicke Cosmology · Around

2012

On the Chameleon Brans-Dicke Cosmology

Bisabr, Yousef

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We consider a generalized Brans-Dicke model in which the scalar field has a potential function and is also allowed to couple non-minimally with the matter sector.

We assume a power law form for the potential and the coupling functions as the inputs of the model and show that acceleration of the universe can be realized for a constrained range of exponent of the potential function.
We also argue that this accelerating phase is consistent with a large and positive Brans-Dicke parameter.
In our analysis, the potential plays a more important role with respect to the coupling function in dynamics of the universe as the latter does not contribute to any of the relations characterizing evolution of scale factor of the universe and the scalar field.

Built on

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H. Salehi and Y. Bisabr, Int. J. Theo. Phys. 39
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Y. Bisabr, Phys. Rev. D 86
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