Constraining f( R) gravity in solar system, cosmology and binary pulsar systems

摘要

AbstractThef(R)gravity can be cast into the form of a scalar–tensor theory, and scalar degree of freedom can be suppressed in high-density regions by the chameleon mechanism. In this article, for the generalf(R)gravity, using a scalar–tensor representation with the chameleon mechanism, we calculate the parametrized post-Newtonian parametersγandβ, the effective gravitational constantGeff, and the effective cosmological constantΛeff. In addition, for the generalf(R)gravity, we also calculate the rate of orbital period decay of the