The growth factor of matter perturbations in an f(R) gravity

Details The growth factor of matter perturbations in an f(R) gravity The growth factor of matter perturbations in an f(R) gravity

2010-12-10

arxiv.org/abs/1012.2249v1

Eur.Phys.J.C68:271-276,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 5 figures

Scientific paper

10.1140/epjc/s10052-010-1324-4

The growth of matter perturbations in the $f(R)$ model proposed by Starobinsky is studied in this paper. Three different parametric forms of the growth index are considered respectively and constraints on the model are obtained at both the $1\sigma$ and $2\sigma$ confidence levels, by using the current observational data for the growth factor. It is found, for all the three parametric forms of the growth index examined, that the Starobinsky model is consistent with the observations only at the $2\sigma$ confidence level.

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