Do Bound Structures Brake Cosmic Acceleration?

Details Do Bound Structures Brake Cosmic Acceleration? Do Bound Structures Brake Cosmic Acceleration?

2009-12-16

arxiv.org/abs/0912.3157v2

JCAP 1005:023,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

31 pages, 11 figures. Replaced with version published by JCAP -- discussion concerning the strength of the scalar/matter coupl

Scientific paper

10.1088/1475-7516/2010/05/023

In this paper we investigate the impact of the coupling between a quintessence field and clustered matter on the average equation of state of the scalar field. We take the NFW profile to be characteristic of bound structures on galactic and cluster scales, and the isothermal distribution to hold for objects on supercluster scales. Solving analytically for the scalar-field profile, we find that the greatest impact on the equation of state comes from the superclusters. Employing numerical case studies, we verify this effect and probe its dependence on the evolutionary state of the supercluster. An estimate across the Hubble volume yields corrections to the homogeneous equation of state of ~3%, increasing with coupling strength.

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