Environmental screening of dark matter haloes in $f(R)$ gravity

Abstract

In certain theories of modified gravity, solar system constraints on deviations from general relativity (GR) are satisfied by virtue of a so-called screening mechanism, which enables the theory to revert to GR in regions where the matter density is high or the gravitational potential is deep. In the case of chameleon theories, the screening has two contributions -- self-screening, which is due to the mass of an object itself, and environmental screening, which is caused by the surrounding matter -- which are often entangled, with the second contribution being more crucial for less massive objects. A quantitative understanding of the effect of the environment on the screening can prove critical in observational tests of such theories using systems such as the Local Group and dwarf galaxies, for which the environment may be inferred in various ways. We use the high-resolution {\sc liminality} simulation of Shi et al. (2015) to test the fidelity of different definitions of environment. We find that, although the different ways to define environment in practice do not agree with one another perfectly, they can provide useful guidance, and cross checks about how well a dark matter halo is screened. In addition, the screening of subhaloes in dark matter haloes is primarily determined by the environment, with the subhalo mass playing a minor role, which means that lower-resolution simulations where subhaloes are not well resolved can still be useful for understanding the modification of gravity inside subhaloes.

11 pages, 7 figures, 2 tables. Published in MNRAS after minor correction

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Cited by in corpus (10)

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• Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
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• A general framework to test gravity using galaxy clusters I: Modelling the dynamical mass of haloes in $f(R)$ gravity
• Horndeski gravity without screening in binary pulsars
• Challenges in Constraining Gravity with Cosmic Voids
• The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function
• The connection between halo concentrations and assembly histories: a probe of gravity?
• A general framework for unbiased tests of gravity using galaxy clusters
• Skewness as a Probe of Gravity: Real and Redshift Space Counts-In-Cells