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Structure formation as an alternative to dark energy and modified gravity

Published online by Cambridge University Press:  30 May 2009

E. Pécontal ,
T. Buchert ,
Ph. Di Stefano ,
Y. Copin  and
S. Räsänen
S. Räsänen*
Affiliation:
Université de Genève, Département de Physique Théorique, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
*
syksy.rasanen@iki.fi
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Abstract

Observations are inconsistent with a homogeneous andiso-tropic universe with ordinary matter and gravity.The universe is far from exact homogeneity and isotropyat late times, and the effect of the non-linearstructures has to be quantified before concludingthat new physics is needed.We explain how structure formation can lead to acceleratedexpansion, and discuss a semi-realistic model wherethe timescale in the change in the expansion rate emergesfrom the physics of structure formation.

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