Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions

[2407.01668] Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Astrophysics > Cosmology and Nongalactic Astrophysics arXiv:2407.01668 (astro-ph) [Submitted on 1 Jul 2024] Title: Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions Authors: Michael Collier , Sownak Bose , Baojiu Li (ICC, Durham) View a PDF of the paper titled Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions, by Michael Collier and 3 other authors View PDF HTML (experimental) Abstract: We present an in-depth investigation of galaxy clustering based on a new suite of realistic large-box galaxy-formation simulations in $f(R)$ gravity, with a subgrid physics model that has been recalibrated to reproduce various observed stellar and gas properties. We focus on the two-point correlation functions of the luminous red galaxies (LRGs) and emission line galaxies (ELGs), which are primary targets of ongoing and future galaxy surveys such as DESI. One surprising result is that, due to several nontrivial effects of modified gravity on matter clustering and the galaxy-halo connection, the clustering signal does not depend monotonically on the fifth-force strength. For LRGs this complicated behaviour poses a challenge to meaningfully constraining this model. For ELGs, in contrast, this can be straightforwardly explained by the time evolution of the fifth force, which means that weaker $f(R)$ models can display nearly the same -- up to $25\%$ -- deviations from $\Lambda$CDM as the strongest ones, albeit at lower redshifts. This implies that even very weak $f(R)$ models can be strongly constrained, unlike with most other observations. Our results show that galaxy formation acquires a significant environment dependence in $f(R)$ gravity which, if not properly accounted for, may lead to biased constraints on the model. This highlights the essential role of hydrodynamical simulations in future tests of gravity exploring precision galaxy-clustering data from the likes of DESI and Euclid. Comments: 18 pages, 8 figures + 2 figures in appendix Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:2407.01668 [astro-ph.CO] (or arXiv:2407.01668v1 [astro-ph.CO] for this version) https://doi.org/10.48550/arXiv.2407.01668 Focus to learn more arXiv-issued DOI via DataCite Journal reference: MNRAS 534 (2024) Related DOI : https://doi.org/10.1093/mnras/stae2219 Focus to learn more DOI(s) linking to related resources Submission history From: Michael Collier [ view email ] [v1] Mon, 1 Jul 2024 18:00:01 UTC (504 KB) Full-text links: Access Paper: View a PDF of the paper titled Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions, by Michael Collier and 3 other authors View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.CO < prev | next > new | recent | 2024-07 Change to browse by: astro-ph astro-ph.GA References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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