Constraining f(R) gravity in solar system, cosmology and binary pulsar systems
Abstract
The f (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 general f (R) gravity, using a scalar-tensor representation with the chameleon mechanism, we calculate the parametrized post-Newtonian parameters γ and β, the effective gravitational constant Geff, and the effective cosmological constant Λeff. In addition, for the general f (R) gravity, we also calculate the rate of orbital period decay of the binary system due to gravitational radiation. Then we apply these results to specific f (R) models (Hu-Sawicki model, Tsujikawa model and Starobinsky model) and derive the constraints on the model parameters by combining the observations in solar system, cosmological scales and the binary systems.
- Publication:
-
Physics Letters B
- Pub Date:
- February 2018
- DOI:
- 10.1016/j.physletb.2017.12.051
- arXiv:
- arXiv:1711.08991
- Bibcode:
- 2018PhLB..777..286L
- Keywords:
-
- f (R) gravity;
- Cosmology;
- Parametrized post-Newtonian;
- Binary pulsar;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- LaTex, 19 pages,1 figure, typo corrected. To appear in Physics Letters B