Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
Soumya Chakrabarti,
Koushik Dutta,
Jackson Levi Said
Abstract:We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requires a self-interaction of the Brans-Dicke scalar as well as an interaction with ordinary matter. The scalar field in this construct acquires a density-dependent effective mass much like a Chameleon field. We discuss the viability of this setup in the context of Equivalence Principle, Fifth Force and Solar System tests. The cosmologic… Show more
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