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

Arnold, Christian; Li, Baojiu

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