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A general framework to test gravity using galaxy clusters I: Modelling the dynamical mass of haloes in f(R) gravity

Mitchell, Myles A; He, Jian-hua; Arnold, Christian; Li, Baojiu

A general framework to test gravity using galaxy clusters I: Modelling the dynamical mass of haloes in f(R) gravity Thumbnail


Authors

Myles A Mitchell

Jian-hua He

Christian Arnold



Abstract

We propose a new framework for testing gravity using cluster observations, which aims to provide an unbiased constraint on modified gravity models from Sunyaev Zel’dovich (SZ) and X-ray cluster counts and the cluster gas fraction, among other possible observables. Focusing on a popular f(R) model of gravity, we propose a novel procedure to recalibrate mass scaling relations from ΛCDM to f(R) gravity for SZ and X-ray cluster observables. We find that the complicated modified gravity effects can be simply modelled as a dependence on a combination of the background scalar field and redshift, fR(z)/(1 + z), regardless of the f(R) model parameter. By employing a large suite of N-body simulations, we demonstrate that a theoretically derived tanh  fitting formula is in excellent agreement with the dynamical mass enhancement of dark matter haloes for a large range of background field parameters and redshifts. Our framework is sufficiently flexible to allow for tests of other models and inclusion of further observables, and the one-parameter description of the dynamical mass enhancement can have important implications on the theoretical modelling of observables and on practical tests of gravity.

Journal Article Type Article
Acceptance Date Mar 7, 2018
Online Publication Date Mar 9, 2018
Publication Date Jun 11, 2018
Deposit Date Mar 29, 2018
Publicly Available Date Apr 3, 2018
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 477
Issue 1
Pages 1133-1152
DOI https://doi.org/10.1093/mnras/sty636
Public URL https://durham-repository.worktribe.com/output/1363327
Related Public URLs https://arxiv.org/abs/1802.02165

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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