An analytic hybrid halo + perturbation theory model for small-scale correlators: baryons, halos, and galaxies. Issue 11 (10th November 2021)

• Record Type: Journal Article
• Authors: Sullivan, James M.; Seljak, Uroš; Singh, Sukhdeep
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2021:Issue 11(2021)
• Publication Date: 2021-11-10
• Subjects: cosmological parameters from LSS -- power spectrum -- redshift surveys -- cosmological simulations; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2021/11/026
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: We update Halo Zeldovich Perturbation Theory (HZPT, [1]), an analytic model for the two-point statistics of dark matter, to describe halo and galaxy clustering, and galaxy-matter cross-correlation on nonlinear scales. The model correcting Zeldovich has an analytic Fourier transform, and therefore is valid in both configuration space and Fourier space. The model is accurate at the 2%-level or less for P_mm (k< 1 h/Mpc), P_hm (k< 1 h/Mpc), P_hh (k< 2 h/Mpc), Pgm (k< 1 h/Mpc), Pgg (k< 1 h/Mpc), ξmm (r> 1 Mpc/h), ξhm (r> 2 Mpc/h), ξhh (r> 2 Mpc/h), ξgm (r> 1 Mpc/h), ξgg (r> 2 Mpc/h), for LRG-like mock galaxies. We show that the HZPT model for matter correlators can account for the effects of a wide range of baryonic feedback models and provide two extended dark matter models which are of 1% (3%) accuracy for k < 10 (8) h/Mpc. We explicitly model the non-perturbative features of halo exclusion for the halo-halo and galaxy-galaxy correlators, as well as the presence of satellites for galaxy-matter and galaxy-galaxy correlation functions. We perform density estimation using N-body simulations and a wide range of HOD galaxy mocks to obtain correlations of model parameters with the cosmological parameters Ωm and σ8 . HZPT can provide a fast, interpretable, and analytic model for combined-probe analyses of redshift surveys using scales well into the non-linear regime.