Revealing modified gravity signals in matter and halo hierarchical clustering

	Revealing modified gravity signals in matter and halo hierarchical clustering
	Hellwing, Wojciech A.1,2; Koyama, Kazuya 1; Bose, Benjamin 1; Zhao, Gong-Bo1,3
刊名	PHYSICAL REVIEW D
	2017-07-14
卷号	96 期号:2
英文摘要	We use a set of N-body simulations employing a modified gravity (MG) model with Vainshtein screening to study matter and halo hierarchical clustering. As test-case scenarios we consider two normal branch Dvali-Gabadadze-Porrati (nDGP) gravity models with mild and strong growth rate enhancement. We study higher-order correlation functions xi(n)(R) up to n = 9 and associated reduced cumulants S-n(R) = xi(n)(R)/sigma(R)(2n-2). We find that the matter probability distribution functions are strongly affected by the fifth force on scales up to 50h(-1) Mpc, and the deviations from general relativity (GR) are maximized at z = 0. For reduced cumulants S-n, we find that at small scales R <= 6h(-1) Mpc the MG is characterized by lower values, with the deviation growing from 7% in the reduced skewness up to even 40% in S-5. To study the halo clustering we use a simple abundance matching and divide haloes into thee fixed number density samples. The halo two-point functions are weakly affected, with a relative boost of the order of a few percent appearing only at the smallest pair separations (r <= 5h(-1) Mpc). In contrast, we find a strong MG signal in S-n(R)'s, which are enhanced compared to GR. The strong model exhibits a > 3 sigma level signal at various scales for all halo samples and in all cumulants. In this context, we find that the reduced kurtosis to be an especially promising cosmological probe of MG. Even the mild nDGP model leaves a > 3 sigma imprint at small scales R <= 3h(-1) Mpc, while the stronger model deviates from a GR signature at nearly all scales with a significance of >5 sigma. Since the signal is persistent in all halo samples and over a range of scales, we advocate that the reduced kurtosis estimated from galaxy catalogs can potentially constitute a strong MG-model discriminatory as well as GR self-consistency test.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
关键词[WOS]	LARGE-SCALE STRUCTURE ; GALAXY REDSHIFT SURVEY ; BARYON ACOUSTIC-OSCILLATIONS ; DIGITAL SKY SURVEY ; COLD DARK-MATTER ; F(R) GRAVITY ; COSMIC FIELDS ; PRIMORDIAL NUCLEOSYNTHESIS ; GRAVITATIONAL-INSTABILITY ; PERTURBATION-THEORY
收录类别	SCI
语种	英语
WOS记录号	WOS:000405511200005
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8823]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 2.Univ Zielona Gora, Janusz Gil Inst Astron, Ulica Szafrana 2, Zielona Gora, Poland 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Hellwing, Wojciech A.,Koyama, Kazuya,Bose, Benjamin,et al. Revealing modified gravity signals in matter and halo hierarchical clustering[J]. PHYSICAL REVIEW D,2017,96(2).
APA	Hellwing, Wojciech A.,Koyama, Kazuya,Bose, Benjamin,&Zhao, Gong-Bo.(2017).Revealing modified gravity signals in matter and halo hierarchical clustering.PHYSICAL REVIEW D,96(2).
MLA	Hellwing, Wojciech A.,et al."Revealing modified gravity signals in matter and halo hierarchical clustering".PHYSICAL REVIEW D 96.2(2017).