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

Shi, Difu; Li, Baojiu; Han, Jiaxin

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Difu Shi

Jiaxin Han


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 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.


Shi, D., Li, B., & Han, J. (2017). Environmental screening of dark matter haloes in f(R) gravity. Monthly Notices of the Royal Astronomical Society, 469(1), 705-715.

Journal Article Type Article
Acceptance Date Apr 5, 2017
Online Publication Date Apr 8, 2017
Publication Date Jul 21, 2017
Deposit Date Feb 17, 2017
Publicly Available Date Apr 18, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 469
Issue 1
Pages 705-715
Public URL
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Accepted Journal Article (1.2 Mb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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