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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 and iso-tropic universe with ordinary matter and gravity. The universe is far from exact homogeneity and isotropy at late times, and the effect of the non-linear structures has to be quantified before concluding that new physics is needed. We explain how structure formation can lead to accelerated expansion, and discuss a semi-realistic model where the timescale in the change in the expansion rate emerges from the physics of structure formation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 36: Dark Energy and Dark Matter: Observations, Experiments and Theories , 2009 , pp. 63 - 74
Copyright
© EAS, EDP Sciences, 2009

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