Backreaction as an alternative to dark energy and modified gravity

Details Backreaction as an alternative to dark energy and modified gravity Backreaction as an alternative to dark energy and modified gravity

2010-12-03

arxiv.org/abs/1012.0784v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 4 figures. Contribution to the proceedings of the "Beyond the Concordance Model" workshop held at The Stellenbosch I

Scientific paper

The predictions of homogeneous and isotropic cosmological models with ordinary matter and gravity are off by a factor of two in the late universe. One possible explanation is the known breakdown of homogeneity and isotropy due to the formation of non-linear structures. We review how inhomogeneities affect the average expansion rate and can lead to acceleration, and consider a semi-realistic model where the observed timescale of ten billion years emerges from structure formation. We also discuss the relation between the average expansion rate and observed quantities.

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