2012-01-30

Tatsuya Narikawa (Hiroshima University)

Title: Testing modified gravity with halo density profiles

Abstract:

Modifications of gravity provide alternative explanation to dark energy for late-time cosmic acceleration of the Universe. Many modified gravity models (MG) introduce a new scalar degree of freedom (dof) which affects the gravitational force and Poisson equation. However, the solar-system tests require MG to shield the scalar dof in dense regions. We have investigated how the screening mechanism of the scalar dof works on halo scales.

References:

T. Narikawa, R. Kimura, T. Yano and K. Yamamoto,
"Halo models in modified gravity theories with self-accelerated expansion",
arXiv:1108.2346

T. Narikawa and K. Yamamoto,
"Testing gravity with halo density profiles observed through gravitational lensing",
arXiv:1201.4037