Growth factor in f(T) gravity

Details Growth factor in f(T) gravity Growth factor in f(T) gravity

2010-10-18

arxiv.org/abs/1010.3512v3

JCAP 1103:002,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages,1 figure; v2,typos corrected; v3, discussions added, accepted by JCAP

Scientific paper

10.1088/1475-7516/2011/03/002

We derive the evolution equation of growth factor for the matter over-dense perturbation in $f(T)$ gravity. For instance, we investigate its behavior in power law model at small redshift and compare it to the prediction of $\Lambda$CDM and dark energy with the same equation of state in the framework of Einstein general relativity. We find that the perturbation in $f(T)$ gravity grows slower than that in Einstein general relativity if $\p f/\p T>0$ due to the effectively weakened gravity.

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