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

Arnold, Christian; Li, Baojiu

doi:10.1093/mnras/stz2690

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

Arnold, Christian; Li, Baojiu

Authors

Christian Arnold

Professor Baojiu Li baojiu.li@durham.ac.uk
Professor

Abstract

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.

Citation

Arnold, C., & Li, B. (2019). Simulating galaxy formation in f(R) modified gravity: Matter, halo, and galaxy-statistics. Monthly Notices of the Royal Astronomical Society, 490(2), 2507-2520. https://doi.org/10.1093/mnras/stz2690

Journal Article Type	Article
Acceptance Date	Sep 22, 2019
Online Publication Date	Sep 27, 2019
Publication Date	Dec 31, 2019
Deposit Date	Sep 23, 2019
Publicly Available Date	Oct 4, 2019
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	490
Issue	2
Pages	2507-2520
DOI	https://doi.org/10.1093/mnras/stz2690
Related Public URLs	https://arxiv.org/abs/1907.02980

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Copyright 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.