Robust approach to f(R) gravity
Abstract
We consider metric f(R) theories of gravity without mapping them to their scalar-tensor counterpart, but using the Ricci scalar itself as an “extra” degree of freedom. This approach avoids then the introduction of a scalar-field potential that might be ill defined (not single valued). In order to explicitly show the usefulness of this method, we focus on static and spherically symmetric spacetimes and deal with the recent controversy about the existence of extended relativistic objects in certain class of f(R) models.
- Publication:
-
Physical Review D
- Pub Date:
- January 2011
- DOI:
- 10.1103/PhysRevD.83.024039
- arXiv:
- arXiv:1006.5747
- Bibcode:
- 2011PhRvD..83b4039J
- Keywords:
-
- 04.50.Kd;
- 04.40.Dg;
- 95.36.+x;
- Modified theories of gravity;
- Relativistic stars: structure stability and oscillations;
- Dark energy;
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 5 pages