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• W2063001489 abstract "We study structure formation in K-mouflage cosmology whose main feature is the absence of screening effect on quasilinear scales. We show that the growth of structure at the linear level is affected by both a new time dependent Newton constant and a friction term which depend on the background evolution. These combine with the modified background evolution to change the growth rate by up to ten percent since $zensuremath{sim}2$. At the one loop level, we find that the nonlinearities of the K-mouflage models are mostly due to the matter dynamics and that the scalar perturbations can be treated at tree level. We also study the spherical collapse in K-mouflage models and show that the critical density contrast deviates from its $mathrm{ensuremath{Lambda}}$-CDM value and that, as a result, the halo mass function is modified for large masses by an order one factor. Finally we consider the deviation of the matter spectrum from $mathrm{ensuremath{Lambda}}$-CDM on nonlinear scales where a halo model is utilized. We find that the discrepancy peaks around $1text{ }text{ }htext{ }{text{Mpc}}^{ensuremath{-}1}$ with a relative difference which can reach fifty percent. Importantly, these features are still true at larger redshifts, contrary to models of the chameleon-$f(R)$ and Galileon types." @default.
• W2063001489 created "2016-06-24" @default.
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• W2063001489 date "2014-07-07" @default.
• W2063001489 modified "2023-09-25" @default.
• W2063001489 title "K-mouflage cosmology: Formation of large-scale structures" @default.
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• W2063001489 doi "https://doi.org/10.1103/physrevd.90.023508" @default.
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