Abstract
The growth rate of matter perturbations can be used to distinguish between different general relativity dark energy models and also between general relativity dark energy and modified gravity models in explaining cosmic acceleration. We propose as an approximation to the growth factor [Formula: see text] the analytical expression [Formula: see text] (with [Formula: see text]) when the radiation [Formula: see text] is included. The growth factor is analyzed for the dark energy models within general relativity. The growth index [Formula: see text] takes distinct values for each model. We find that the new analytical form [Formula: see text] approximates [Formula: see text] better than [Formula: see text].
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