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• W2904347682 abstract "The splashback radius ${r}_{mathrm{sp}}$ has been identified in cosmological $N$-body simulations as an important scale associated with gravitational collapse and the phase-space distribution of recently accreted material. We employ a semianalytical approach to study the spherical collapse of dark matter halos in symmetron gravity and provide, for the first time, insights into how the phenomenology of splashback is affected by modified gravity. The symmetron is a scalar-tensor theory which exhibits a screening mechanism whereby higher-density regions are screened from the effects of a fifth force. In this model, we find that, as overdensities grow over cosmic time, the inner region becomes heavily screened. In particular, we identify a sector of the parameter space for which material currently sitting at ${r}_{mathrm{sp}}$ has followed, during the collapse, the formation of this screened region. As a result, we find that for this part of the parameter space the splashback radius is maximally affected by the symmetron force, and we predict changes in ${r}_{mathrm{sp}}$ up to around 10% compared to its General Relativity value. Because this margin is within the precision of present splashback experiments, we expect this feature to soon provide constraints for symmetron gravity on previously unexplored scales." @default.
• W2904347682 created "2018-12-22" @default.
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• W2904347682 date "2019-03-21" @default.
• W2904347682 modified "2023-09-26" @default.
• W2904347682 title "Splashback radius in symmetron gravity" @default.
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• W2904347682 doi "https://doi.org/10.1103/physrevd.99.064030" @default.
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