Structure Formation by the Fifth Force III: Segregation of Baryons and Dark Matter

Details Structure Formation by the Fifth Force III: Segregation of Baryons and Dark Matter Structure Formation by the Fifth Force III: Segregation of Baryons and Dark Matter

2010-01-18

arxiv.org/abs/1001.3152v2

Phys. Rev. D81, 104047 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 11 figures, 1 table. Revised version accepted for publication in Phys. Rev. D. For a high resolution version see h

Scientific paper

10.1103/PhysRevD.81.104047

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 structure, 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 find that the chameleon nature of the scalar field makes the internal density profiles of halos dependent on the environment in a very nontrivial way.

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