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Simulating galaxy formation in f(R) modified gravity : matter, halo, and galaxy-statistics.

Arnold, Christian and Li, Baojiu (2019) 'Simulating galaxy formation in f(R) modified gravity : matter, halo, and galaxy-statistics.', Monthly notices of the Royal Astronomical Society., 490 (2). pp. 2507-2520.


We present an analysis of the matter, halo and galaxy clustering in f(R)-gravity employing the SHYBONE full-physics hydrodynamical simulation suite. Our analysis focuses on the interplay between baryonic feedback and f(R)-gravity in the matter power spectrum, the matter and halo correlation functions, the halo and galaxy-host-halo mass function, the subhalo and satellite-galaxy count and the correlation function of the stars in our simulations. Our studies of the matter power spectrum in full physics simulations in f(R)-gravity show, that it will be very difficult to derive accurate fitting formulae for the power spectrum enhancement in f(R)-gravity which include baryonic effects. We find that the enhancement of the halo mass function due to f(R)-gravity and its suppression due to feedback effects do not show significant back-reaction effects and can thus be estimated from independent GR-hydro and f(R) dark matter only simulations. Our simulations furthermore show, that the number of subhaloes and satellite-galaxies per halo is not significantly affected by f(R)-gravity. Low mass haloes are nevertheless more likely to be populated by galaxies in f(R)-gravity. This suppresses the clustering of stars and the galaxy correlation function in the theory compared to standard cosmology.

Item Type:Article
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Publisher statement:This article has been accepted for publication in the Monthly notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:22 September 2019
Date deposited:04 October 2019
Date of first online publication:27 September 2019
Date first made open access:24 October 2019

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