The growth of matter perturbations in the f(T) gravity

Details The growth of matter perturbations in the f(T) gravity The growth of matter perturbations in the f(T) gravity

2012-04-11

arxiv.org/abs/1204.2333v1

International Journal of Modern Physics D Vol. 20, No. 7 (2011) 1301-1311

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages 4 figures

Scientific paper

In this paper, we study the growth index of matter density perturbations for the power law model in $f(T)$ gravity. Using the parametrization $\gamma(z)=\gamma_0+\gamma_1 {z\over 1+z}$ for the growth index, which approximates the real evolution of $\gamma(z)$ very well, and the observational data of the growth factor, we find that, at $1\sigma$ confidence level, the power law model in $f(T)$ gravity is consistent with the observations, since the obtained theoretical values of $\gamma_0$ and $\gamma_1$ are in the allowed region.

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