MODELING THE NONLINEAR CLUSTERING IN MODIFIED GRAVITY MODELS. I. A FITTING FORMULA FOR THE MATTER POWER SPECTRUM OF f(R) GRAVITY

被引：51

作者：

Zhao, Gong-Bo ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[2] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2014年 / 211卷 / 02期

关键词：

cosmology: observations; cosmology: theory; galaxies: halos; large-scale structure of universe; BARYON ACOUSTIC-OSCILLATIONS; CODE; EVOLUTION; UNIVERSE; SIMULATIONS; STATISTICS; TESTS;

D O I：

10.1088/0067-0049/211/2/23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Based on a suite of N-body simulations of the Hu-Sawicki model of f (R) gravity with different sets of model and cosmological parameters, we develop a new fitting formula with a numeric code, MGHalofit, to calculate the nonlinear matter power spectrum P(k) for the Hu-Sawicki model. We compare the MGHalofit predictions at various redshifts (z <= 1) to the f (R) simulations and find that the relative error of the MGHalofit fitting formula of P(k) is no larger than 6% at k <= 1 h Mpc(-1) and 12% at k epsilon (1, 10] h Mpc(-1), respectively. Based on a sensitivity study of an ongoing and a future spectroscopic survey, we estimate the detectability of a signal of modified gravity described by the Hu-Sawicki model using the power spectrum up to quasi-nonlinear scales.

引用

页数：12

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