Growth rate in inhomogeneous interacting vacuum models. (arXiv:1811.03646v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Borges_H/0/1/0/all/0/1">Humberto A. Borges</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hepp_P/0/1/0/all/0/1">Patrícia Hepp</a>
We study the effects of vacuum energy perturbations on the evolution of the
dark matter growth rate in a decomposed Chaplygin gas model with interacting
dark matter and vacuum energy. We consider two different cases: (i) geodesic
dark matter with homogeneous vacuum, and (ii) a covariant ansatz for vacuum
density perturbations. In the latter case, we show that the vacuum
perturbations are very tiny as compared to dark matter perturbations on
sub-horizon scales. In spite of that, depending on the value of the Chaplygin
gas parameter {alpha}, vacuum perturbations suppress or enhance the dark
matter growth rate as compared to the geodesic model.
We study the effects of vacuum energy perturbations on the evolution of the
dark matter growth rate in a decomposed Chaplygin gas model with interacting
dark matter and vacuum energy. We consider two different cases: (i) geodesic
dark matter with homogeneous vacuum, and (ii) a covariant ansatz for vacuum
density perturbations. In the latter case, we show that the vacuum
perturbations are very tiny as compared to dark matter perturbations on
sub-horizon scales. In spite of that, depending on the value of the Chaplygin
gas parameter {alpha}, vacuum perturbations suppress or enhance the dark
matter growth rate as compared to the geodesic model.
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