Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Structure formation by the fifth force : segregation of baryons and dark matter.

Li, B. and Zhao, H. (2010) 'Structure formation by the fifth force : segregation of baryons and dark matter.', Physical review D., 81 (10). p. 104047.

Abstract

In this paper we present the results of N-body simulations with a scalar field coupled differently to cold dark matter (CDM) and baryons. The scalar field potential and coupling function are chosen such that the scalar field acquires a heavy mass in regions with high CDM density and thus behaves like a chameleon. We focus on how the existence of the scalar field affects the formation of nonlinear large-scale structures, and how the different couplings of the scalar field to baryons and CDM particles lead to different distributions and evolutions for these two matter species, both on large scales and inside virialized halos. As expected, the baryon-CDM segregation increases in regions where the fifth force is strong, and little segregation in dense regions. We also introduce an approximation method to identify the virialized halos in coupled scalar field models which takes into account the scalar field coupling and which is easy to implement numerically. It is found that the chameleon nature of the scalar field makes the internal density profiles of halos dependent on the environment in a very nontrivial way.

Item Type:Article
Full text:(NA) Not Applicable
Download PDF (arXiv version)
(591Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1103/PhysRevD.81.104047
Publisher statement:© 2010 American Physical Society
Date accepted:No date available
Date deposited:No date available
Date of first online publication:May 2010
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar