Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-02
Phys.Rev.D79:083518,2009
Astronomy and Astrophysics
Astrophysics
12 pages, 10 figures; v2: revised version accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.79.083518
The statistical properties of dark matter halos, the building blocks of cosmological observables associated with structure in the universe, offer many opportunities to test models for cosmic acceleration, especially those that seek to modify gravitational forces. We study the abundance, bias and profiles of halos in cosmological simulations for one such model: the modified action f(R) theory. In the large field regime that is accessible to current observations, enhanced gravitational forces raise the abundance of rare massive halos and decrease their bias but leave their (lensing) mass profiles largely unchanged. This regime is well described by scaling relations based on a modification of spherical collapse calculations. In the small field regime, enhanced forces are suppressed inside halos and the effects on halo properties are substantially reduced for the most massive halos. Nonetheless, the scaling relations still retain limited applicability for the purpose of establishing conservative upper limits on the modification to gravity.
Hu Wayne
Lima Marcos
Oyaizu Hiroaki
Schmidt Fabian
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