Scale dependence of cosmological backreaction

Details Scale dependence of cosmological backreaction Scale dependence of cosmological backreaction

2007-10-26

arxiv.org/abs/0710.5073v4

Phys.Rev.D78:083531,2008

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures; v3: substantial modifications, new figures

Scientific paper

10.1103/PhysRevD.78.083531

Due to the non-commutation of spatial averaging and temporal evolution, inhomogeneities and anisotropies (cosmic structures) influence the evolution of the averaged Universe via the cosmological backreaction mechanism. We study the backreaction effect as a function of averaging scale in a perturbative approach up to higher orders. We calculate the hierarchy of the critical scales, at which 10% effects show up from averaging at different orders. The dominant contribution comes from the averaged spatial curvature, observable up to scales of 200 Mpc. The cosmic variance of the local Hubble rate is 10% (5%) for spherical regions of radius 40 (60) Mpc. We compare our result to the one from Newtonian cosmology and Hubble Space Telescope Key Project data.

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