Regular Article - Theoretical Physics
An analytic calculation of the growth index for dark energy model
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, Beijing, 100190, People’s Republic of China
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Accepted: 2 July 2014
Published online: 17 July 2014
We derive the analytic formula of the growth index for the dark energy model where the effect on the growth of matter density perturbation from modified gravity (MG) is encoded in the effective Newton coupling constant in MG (or equivalently ). Based on the analytic formula, we propose that the parameter can be directly found by comparing the observed growth rate to the prediction of in general relativity.
© SIF and Springer-Verlag Berlin Heidelberg, 2014