Cluster Constraints on f(R) Gravity

Details Cluster Constraints on f(R) Gravity Cluster Constraints on f(R) Gravity

2009-08-17

arxiv.org/abs/0908.2457v2

Phys.Rev.D80:083505,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 7 figures; v2: minor revisions, matches version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.083505

Modified gravitational forces in models that seek to explain cosmic acceleration without dark energy typically predict deviations in the abundance of massive dark matter halos. We conduct the first, simulation calibrated, cluster abundance constraints on a modified gravity model, specifically the modified action f(R) model. The local cluster abundance, when combined with geometric and high redshift data from the cosmic microwave background, supernovae, H_0 and baryon acoustic oscillations, improve previous constraints by nearly 4 orders of magnitude in the field amplitude. These limits correspond to a 2 order of magnitude improvement in the bounds on the range of the force modification from the several Gpc scale to the tens of Mpc scale.

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