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Testing General Relativity using the Environmental Dependence of Dark Matter Halos

In this Letter, we investigate the environmental dependence of dark matter halos in theories that attempt to explain the accelerated expansion of the Universe by modifying general relativity (GR). Using high-resolution N-body simulations in f(R) gravity models which recover GR in dense environments by virtue of the chameleon mechanism, we find a strong environmentally-dependent difference between the lensing mass and dynamical mass estimates of dark matter halos. This environmental dependence of the halo properties can be used as a smoking gun to test GR observationally.

preprint2011arXivOpen access
Gong-Bo ZhaoBaojiu LiKazuya Koyama
astro-ph.COhep-phgr-qchep-th
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Gong-Bo ZhaoBaojiu LiKazuya Koyama

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