Stability of modified gravity models
Abstract
Conditions for the existence and stability of de Sitter space in modified gravity are derived by considering inhomogeneous perturbations in a gauge-invariant formalism. The stability condition coincides with the corresponding condition for stability with respect to homogeneous perturbations, while this is not the case in scalar-tensor gravity. The stability criterion is applied to various modified gravity models of the early and the present universe.
- Publication:
-
Physical Review D
- Pub Date:
- December 2005
- DOI:
- 10.1103/PhysRevD.72.124005
- arXiv:
- arXiv:gr-qc/0511094
- Bibcode:
- 2005PhRvD..72l4005F
- Keywords:
-
- 04.50.+h;
- 98.80.-k;
- Gravity in more than four dimensions Kaluza-Klein theory unified field theories;
- alternative theories of gravity;
- Cosmology;
- General Relativity and Quantum Cosmology;
- Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 22 pages, LaTeX, to appear in Phys. Rev. D