Testing gravity with halo density profiles observed through gravitational lensing

Details Testing gravity with halo density profiles observed through gravitational lensing Testing gravity with halo density profiles observed through gravitational lensing

2012-01-19

arxiv.org/abs/1201.4037v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

26pages, 15figures

Scientific paper

We present a new test of the modified gravity endowed with the Vainshtein mechanism with the density profile of a galaxy cluster halo observed through gravitational lensing. A scalar degree of freedom in the galileon modified gravity is screened by the Vainshtein mechanism to recover Newtonian gravity on high-density regions, however it might not be completely hidden on the outer side of a cluster of galaxies. Then the modified gravity might yield an observational signature in a surface mass density of a cluster of galaxies measured through gravitational lensing, since the scalar field could contribute to the lensing potential. We investigate how the breaking of the Vainshtein mechanism affects the surface mass density observed through gravitational lensing, assuming that the density profile of a cluster of galaxies follows the original Navarro-Frenk-White (NFW) profile, the generalized NFW profile and the Einasto profile. We compare the theoretical predictions with observational results of the surface mass density reported recently by other researchers. We obtain constraints on the amplitude and the typical scale of the breaking of the Vainshtein mechanism in a subclass of the generalized galileon model.

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