The stability of modified gravity models

Details The stability of modified gravity models The stability of modified gravity models

2005-11-16

arxiv.org/abs/gr-qc/0511094v1

Phys.Rev.D72:124005,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, LaTeX, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.72.124005

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.

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