Halo models in modified gravity theories with self-accelerated expansion

Details Halo models in modified gravity theories with self-accelerated expansion Halo models in modified gravity theories with self-accelerated expansion

2011-08-11

arxiv.org/abs/1108.2346v2

Int.Mod.Phys.D20:2383-2397,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15pages, 6 figures, maches the version to be published in Int. J. Mod. Phys. D, typos corrected

Scientific paper

10.1142/S0218271811020421

We investigate the structure of halos in the sDGP (self-accelerating branch of the Dvali-Gavadadze-Porrati braneworld gravity) model and the galileon modified gravity model on the basis of the static and spherically symmetric solutions of the collisionless Boltzmann equation, which reduce to the singular isothermal sphere model and the King model in the limit of Newtonian gravity. The common feature of these halos is that the density of a halo in the outer region is larger (smaller) in the sDGP (galileon) model, respectively, in comparison with Newtonian gravity. This comes from the suppression (enhancement) of the effective gravity at large distance in the sDGP (galileon) model, respectively. However, the difference between these modified gravity models and Newtonian gravity only appears outside the halo due to the Vainshtein mechanism, which makes it difficult to distinguish between them. We also discuss the case in which the halo density profile is fixed independently of the gravity model for comparison between our results and previous work.

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