Local void vs dark energy: confrontation with WMAP and type Ia supernovae

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Published 21 September 2009 Published under licence by IOP Publishing Ltd
, , Citation Stephon Alexander et al JCAP09(2009)025 DOI 10.1088/1475-7516/2009/09/025

1475-7516/2009/09/025

Abstract

It is now a known fact that if we happen to be living in the middle of a large underdense region, then we will observe an ``apparent acceleration'', even when any form of dark energy is absent. In this paper, we present a ``Minimal Void'' scenario, i.e. a ``void'' with minimal underdensity contrast (of about -0.4) and radius (∼ 200−250 Mpc/h) that can, not only explain the supernovae data, but also be consistent with the 3-yr WMAP data. We also discuss consistency of our model with various other measurements, and in particular consistency with local measurements of the Hubble parameter. We also point out possible observable signatures.

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