Unifying the study of background dynamics and perturbations in $f(R)$-gravity

Details Unifying the study of background dynamics and perturbations in $f(R)$-gravity Unifying the study of background dynamics and perturbations in $f(R)$-gravity

2008-12-11

arxiv.org/abs/0812.2211v1

Astronomy and Astrophysics

Astrophysics

20 pages, 6 figures, submitted to Physical Review D

Scientific paper

In this paper we show how the covariant gauge invariant equations for the evolution of scalar, vector and tensor perturbations for a generic $f(R)$-gravity theory can be recast in order to exploit the power of dynamical system methodology. In this way, recent results describing the dynamics of the background FRW model can be easily combined with these equations to reveal important details pertaining to the evolution of cosmological models in fourth order gravity.

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