Effects of dark sectors' mutual interaction on the growth of structures

Details Effects of dark sectors' mutual interaction on the growth of structures Effects of dark sectors' mutual interaction on the growth of structures

2009-02-04

arxiv.org/abs/0902.0660v3

JCAP 0907:030,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 4 figures, revised version, to appear in JCAP

Scientific paper

10.1088/1475-7516/2009/07/030

We present a general formalism to study the growth of dark matter perturbations when dark energy perturbations and interactions between dark sectors are present. We show that dynamical stability of the growth of structure depends on the type of coupling between dark sectors. By taking the appropriate coupling to ensure the stable growth of structure, we observe that the effect of the dark sectors' interaction overwhelms that of dark energy perturbation on the growth function of dark matter perturbation. Due to the influence of the interaction, the growth index can differ from the value without interaction by an amount within the observational sensibility, which provides a possibility to disclose the interaction between dark sectors through future observations on the growth of large structure.

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