2012-01-30

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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