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

Zhao, H.; Maccio, A.; Li, B.; Hoekstra, H.; Feix, M.

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


H. Zhao

A. Maccio

H. Hoekstra

M. Feix


We lay out the framework to numerically study nonlinear structure formation in the context of scalar-field-coupled cold dark matter models (phivCDM models) where the scalar field phiv serves as dynamical dark energy. Adopting parameters for the scalar field that leave negligible effects on the cosmic microwave background (CMB) spectrum, we generate the initial conditions for our N-body simulations. The simulations follow the spatial distributions of dark matter and the scalar field, solving their equations of motion using a multilevel adaptive grid technique. We show that the spatial configuration of the scalar field depends sensitively on the local density field. The phivCDM model differs from standard ΛCDM 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.

Journal Article Type Article
Publication Date Apr 1, 2010
Deposit Date Jan 20, 2012
Publicly Available Date May 1, 2014
Journal Astrophysical Journal Letters
Print ISSN 2041-8205
Electronic ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 712
Issue 2
Pages L179-L183
Keywords Cosmology: theory, Methods: numerical.
Public URL


Published Journal Article (785 Kb)

Copyright Statement
© 2010. The American Astronomical Society. All rights reserved.

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