Structure formation as an alternative to dark energy and modified gravity

Details Structure formation as an alternative to dark energy and modified gravity Structure formation as an alternative to dark energy and modified gravity

2008-11-14

arxiv.org/abs/0811.2364v1

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, contribution to the proceedings of the July 2008 CRAL-IPNL conference "Dark Energy and Dark Matter"

Scientific paper

Observations are inconsistent with a homogeneous and isotropic 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 of the change in the expansion rate emerges from the physics of structure formation.

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