2007/10/31 by Juliane Behrend, Iain A. Brown, Georg Robbers · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc
paper · pdf · doi:10.1088/1475-7516/2008/01/013
published as JCAP0801:013,2008 · 15 pages, 8 figures; replaced by version accepted by JCAP
arxiv created 2007/12/18 · openalex publication_date 2008/01/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
We write 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 ΛCDM cosmologies. In both cases the effective energy density arising from linear perturbations is of the order of 10 −5 times the matter density, as would be expected, with an effective equation of state w eff ≈−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 .