Marked clustering statistics in f(R) gravity cosmologies

Hernández-Aguayo, César; Baugh, Carlton M.; Li, Baojiu

doi:10.1093/mnras/sty1822

Marked clustering statistics in f(R) gravity cosmologies

Hernández-Aguayo, César; Baugh, Carlton M.; Li, Baojiu

Authors

César Hernández-Aguayo

Carlton M. Baugh

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

Abstract

We analyse the two-point and marked correlation functions (mCFs) of haloes and galaxies in three variants of the chameleon f(R) gravity model using N-body simulations, and compare to a fiducial Λ cold dark matter model based on general relativity (GR). Using a halo occupation distribution (HOD) prescription, we populate dark matter haloes with galaxies, where the HOD parameters have been tuned such that the galaxy number densities and the real-space galaxy two-point correlation functions in the modified gravity models match those in GR to within 1–3 per cent. We test the idea that since the behaviour of gravity is dependent on environment, mCFs may display a measurable difference between the models. For this we test marks based on the density field and the Newtonian gravitational potential. We find that the galaxy mCF shows significant differences measured in different models on scales smaller than r ≲ 20 h−1 Mpc. Guided by simulations to identify a suitable mark, this approach could be used as a new probe of the accelerated expansion of the Universe.

Citation

Hernández-Aguayo, C., Baugh, C. M., & Li, B. (2018). Marked clustering statistics in f(R) gravity cosmologies. Monthly Notices of the Royal Astronomical Society, 479(1), 4824-4835. https://doi.org/10.1093/mnras/sty1822

Journal Article Type	Article
Acceptance Date	Jul 5, 2018
Online Publication Date	Jul 7, 2018
Publication Date	Oct 1, 2018
Deposit Date	Jul 23, 2018
Publicly Available Date	Jul 25, 2018
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	479
Issue	1
Pages	4824-4835
DOI	https://doi.org/10.1093/mnras/sty1822
Related Public URLs	https://arxiv.org/abs/1801.08880

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.