Halo models in modified gravity theories with self-accelerated expansion

Tatsuya Narikawa*, Rampei Kimura, Tatsunosuke Yano, Kazuhiro Yamamoto


研究成果: Article査読

6 被引用数 (Scopus)


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.

ジャーナルInternational Journal of Modern Physics D
出版ステータスPublished - 2011 11月 25

ASJC Scopus subject areas

  • 数理物理学
  • 天文学と天体物理学
  • 宇宙惑星科学


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