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Cosmology when living near the Great Attractor

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Title:		Cosmology when living near the Great Attractor
Authors:		Valkenburg, Wessel; Eggers Bjaelde, Ole
Publication:		eprint arXiv:1203.4567
Publication Date:		03/2012
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		8 pages, 6 figures, Submitted to MNRAS
Bibliographic Code:		2012arXiv1203.4567V

Abstract

If we live in the vicinity of the hypothesized Great Attractor, the age of the universe as inferred from the local expansion rate can be off by three per cent. We study the effect that living inside or near a massive overdensity has on cosmological parameters induced from observations of supernovae, the Hubble parameter and the Cosmic Microwave Background. We compare the results to those for an observer in a perfectly homogeneous LCDM universe. We find that for instance the inferred value for the global Hubble parameter changes by around three per cent if we happen to live inside a massive overdensity such as the hypothesized Great Attractor. Taking into account the effect of such structures on our perception of the universe makes cosmology perhaps less precise, but more accurate.

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