Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 477, Issue 1, Pages 1133-1152Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty636
Keywords
methods: numerical; dark energy; cosmology: theory
Categories
Funding
- Durham Centre for Doctoral Training in Data Intensive Science - UK Science and Technology Facilities Council (STFC) [ST/P006744/1]
- Durham University
- European Research Council [ERC-StG-716532-PUNCA]
- Durham Cofund Junior Research Fellowship (JRF)
- STFC [ST/P000541/1, ST/L00075X/1, ST/H008519/1, ST/K00087X/1, ST/K003267/1]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC [ST/I00162X/1, ST/H008519/1, ST/L00075X/1, ST/K00042X/1, ST/P000541/1, 1949176] Funding Source: UKRI
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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 A cold dark matter (ACDM) 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, f(R)(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.
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