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

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

doi:10.1088/2041-8205/712/2/l179

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

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

Authors

H. Zhao

A. Maccio

Professor Baojiu Li baojiu.li@durham.ac.uk
Professor

H. Hoekstra

M. Feix

Abstract

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.

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, 712(2), L179-L183. https://doi.org/10.1088/2041-8205/712/2/l179

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
DOI	https://doi.org/10.1088/2041-8205/712/2/l179
Keywords	Cosmology: theory, Methods: numerical.