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Structure formation by fifth force : power spectrum from N-body simulations

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zhao2010astrophysicsjlettl179.pdf (766.8Kb)
Date
17/03/2010
Author
Zhao, HongSheng
Maccio, Andrea
Li, Baojiu
Hoekstra, Henk
Feix, Martin
Keywords
Cosmology: theory
Methods: numerical
QC Physics
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Abstract
We lay out the framework to numerically study nonlinear structure formation in the context of scalar-field-coupled cold dark matter models (phiCDM models) where the scalar field phi serves as dynamical dark energy. Adopting parameters for the scalar field which yield a realistic CMB spectrum, we generate the initial conditions for our Nbody simulations, which follow the spatial distributions of dark matter and the scalar field, by solving their equations of motion using the multilevel adaptive grid technique. We show that the spatial configuration of the scalar field tracks both the voids and clusters of dark matter. The phiCDM model differs from standard LCDM at small scales with observable modifications of, e.g., the mass function of halos as well as the matter power spectrum. Nevertheless, the predictions of both models for the Hubble expansion and the CMB spectrum are virtually indistinguishable. Hence, galaxy cluster counts and weak lensing observations, which probe structure formation at small scales, are needed to falsify this class of models.
Citation
Zhao , H , Maccio , A , Li , B , Hoekstra , H & Feix , M 2010 , ' Structure formation by fifth force : power spectrum from N-body simulations ' , Astrophysical Journal Letters , vol. 712 , no. 2 , pp. L179-L183 . https://doi.org/10.1088/2041-8205/712/2/L179
Publication
Astrophysical Journal Letters
Status
Peer reviewed
DOI
https://doi.org/10.1088/2041-8205/712/2/L179
ISSN
2041-8205
Type
Journal article
Rights
© 2010. The American Astronomical Society. All rights reserved
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4743

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

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