Inhomogeneity effects in Cosmology

Details Inhomogeneity effects in Cosmology Inhomogeneity effects in Cosmology

2011-03-11

arxiv.org/abs/1103.2335v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

29 pages. For special issue of CQG on inhomogeneous cosmologies

Scientific paper

This article looks at how inhomogeneous spacetime models may be significant for cosmology. First it looks at how the averaging process may affect large scale dynamics, with backreaction effects leading to effective contributions to the averaged energy-momentum tensor. Secondly it considers how local inhomogeneities may affect cosmological observations in cosmology, possibly significantly affecting the concordance model parameters. Thirdly it presents the possibility that the universe is spatially inhomogeneous on Hubble scales, with a violation of the Copernican principle leading to an apparent acceleration of the universe. This could perhaps even remove the need for the postulate of dark energy.

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