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Voids in coupled scalar field cosmology

Li, B.

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Abstract

We study the properties of voids in two different types of coupled scalar field theories. Due to the fifth force produced by the scalar field coupling, the matter particles feel stronger attraction amongst each other and cluster more quickly than they do in the standard ΛCDM model. Consequently, voids in the coupled scalar field theories start to develop earlier and end up bigger, which is confirmed by our numerical simulations. We find that a significantly larger portion of the whole space is underdensed in the coupled scalar field theories and there are more voids whose sizes exceed given thresholds. This is more prominent in early times because at later times the underdense regions have already been evacuated in coupled scalar field theories and there is time for the ΛCDM model to catch up. The coupled scalar field theories also predict a sharper transition between voids and high-density regions. All in all, the qualitative behaviour is different not only from the ΛCDM result, but also amongst specific coupled scalar field models, making voids a potential candidate to test alternative ideas about the cosmic structure formation.

Journal Article Type Article
Publication Date Mar 11, 2011
Deposit Date Jan 20, 2012
Publicly Available Date May 1, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 411
Issue 4
Pages 2615-2627
DOI https://doi.org/10.1111/j.1365-2966.2010.17867.x
Keywords Methods: numerical, Cosmology: theory, Dark energy, Large-scale structure of Universe.
Public URL https://durham-repository.worktribe.com/output/1499686

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2010 The Authors Monthly Notices of the Royal Astronomical Society © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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