Cosmological Backreaction from Perturbations

Details Cosmological Backreaction from Perturbations Cosmological Backreaction from Perturbations

2007-10-26

arxiv.org/abs/0710.4964v2

JCAP0801:013,2008

Astronomy and Astrophysics

Astrophysics

15 pages, 8 figures; replaced by version accepted by JCAP

Scientific paper

10.1088/1475-7516/2008/01/013

We reformulate the averaged Einstein equations in a form suitable for use with Newtonian gauge linear perturbation theory and track the size of the modifications to standard Robertson-Walker evolution on the largest scales as a function of redshift for both Einstein de-Sitter and Lambda CDM cosmologies. In both cases the effective energy density arising from linear perturbations is of the order of 10^-5 the matter density, as would be expected, with an effective equation of state w ~ -1/19. Employing a modified Halofit code to extend our results to quasilinear scales, we find that, while larger, the deviations from Robertson-Walker behaviour remain of the order of 10^-5.

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