EAS Publications Series

Issue		EAS Publications Series Volume 36, 2009 Dark Energy and Dark Matter: Observations, Experiments and Theories
Page(s)		83 - 90
DOI		10.1051/eas/0936010
Published online		30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 83-90
DOI: 10.1051/eas/0936010

Signatures of cosmological backreaction

N. Li and D.J. Schwarz

Fakultät für Physik, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany; ;

li@physik.uni-bielefeld.de
dschwarz@physik.uni-bielefeld.de

Published online: 30 May 2009

Abstract
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, observable up to scales of $200~\mbox{Mpc}$ . The cosmic variance of the local Hubble rate is $10\%$ $(5\%)$ for spherical regions of radius 40 $(60)~\mbox{Mpc}$ . We compare our results to the Hubble Space Telescope (HST) Key Project data.

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