Do Bound Structures Brake Cosmic Acceleration?

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...

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Bibliographic Details
Published inarXiv.org
Main Authors Schrempp, Lily, Brown, Iain A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 09.06.2010
Subjects
Acceleration
Case studies
Coupling
Dependence
Equations of state
Galactic clusters
Physics - Cosmology and Nongalactic Astrophysics
Physics - General Relativity and Quantum Cosmology
Quintessence (cosmology)
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Summary: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.
Bibliography:HD-THEP-09-29
ISSN:2331-8422
DOI:10.48550/arxiv.0912.3157