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