Real- and redshift-space halo clustering in f(R) cosmologies

Arnalte-Mur, P.; Hellwing, W.A.; Norberg, P.

Abstract

We present two-point correlation function statistics of the mass and the haloes in the chameleon f(R) modified gravity scenario using a series of large-volume N-body simulations. Three distinct variations of f(R) are considered (F4, F5 and F6) and compared to a fiducial Λ cold dark matter (ΛCDM) model in the redshift range z ∈ [0, 1]. We find that the matter clustering is indistinguishable for all models except for F4, which shows a significantly steeper slope. The ratio of the redshift- to real-space correlation function at scales >20 h−1 Mpc agrees with the linear General Relativity (GR) Kaiser formula for the viable f(R) models considered. We consider three halo populations characterized by spatial abundances comparable to that of luminous red galaxies and galaxy clusters. The redshift-space halo correlation functions of F4 and F5 deviate significantly from ΛCDM at intermediate and high redshift, as the f(R) halo bias is smaller than or equal to that of the ΛCDM case. Finally, we introduce a new model-independent clustering statistic to distinguish f(R) from GR: the relative halo clustering ratio – R R. The sampling required to adequately reduce the scatter in R R will be available with the advent of the next-generation galaxy redshift surveys. This will foster a prospective avenue to obtain largely model-independent cosmological constraints on this class of modified gravity models.

Citation

Arnalte-Mur, P., Hellwing, W., & Norberg, P. (2017). Real- and redshift-space halo clustering in f(R) cosmologies. Monthly Notices of the Royal Astronomical Society, 467(2), 1569-1585. https://doi.org/10.1093/mnras/stx196

• Journal Article Type: Article
• Acceptance Date: Jan 19, 2017
• Online Publication Date: Jan 22, 2017
• Publication Date: May 21, 2017
• Deposit Date: Mar 13, 2017
• Publicly Available Date: Mar 17, 2017
• 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: 467
• Issue: 2
• Pages: 1569-1585
• DOI: https://doi.org/10.1093/mnras/stx196
• Public URL: https://durham-repository.worktribe.com/output/1361392