Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field

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 the Equivalence Principle, Fifth Force, and Solar System tests. The cosmological consistency is adjudged in comparison with observational data from recalibrated light curves of type Ia supernova (JLA), the Hubble parameter measurements (OHD), and the Baryon Acoustic Oscillation (BAO). We deduct that the astrophysical constraints indeed favor the existence of a mild scalar-matter interaction in the Jordan Frame.

14 pages, 10 figures, Accepted for publication in MNRAS

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Cited by in corpus (7)

• Noncompactified Kaluza--Klein Gravity
• Imprints of screened dark energy on nonlocal quantum correlations
• Dynamics of self-gravitating systems in non-linearly magnetized chameleonic Brans-Dicke gravity
• Cosmic Acceleration and Geodesic Deviation in Chameleon Scalar Field Model
• Future Dark Energy Constraints from Atomic Clocks
• Solar System and Atomic Clock Bounds on Locally Coupled Swampland Scalars
• A New Approach to Flatness, Horizon and Late-time Accelerating Expansion Problems on the basis of Mach Principle