Backreaction as an alternative to dark energy and modified gravity - INSPIRE

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Backreaction as an alternative to dark energy and modified gravity

Syksy Rasanen

Dec, 2010

22 pages

e-Print:

1012.0784 [astro-ph.CO]

Report number:

HIP-2010-34-TH

View in:

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Abstract: (arXiv)

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.

Note:

22 pages, 4 figures. Contribution to the proceedings of the "Beyond the Concordance Model" workshop held at The Stellenbosch Institute for Advanced Study, 23.-27. August 2010

References(56)

Figures(7)

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