Theoretical accuracy in cosmological growth estimation

	Theoretical accuracy in cosmological growth estimation
	Bose, Benjamin 1; Koyama, Kazuya 1; Hellwing, Wojciech A.1,2; Zhao, Gong-Bo1,3 ; Winther, Hans A.1
刊名	PHYSICAL REVIEW D
	2017-07-18
卷号	96 期号:2
英文摘要	We elucidate the importance of the consistent treatment of gravity-model specific nonlinearities when estimating the growth of cosmological structures from redshift space distortions (RSD). Within the context of standard perturbation theory (SPT), we compare the predictions of two theoretical templates with redshift space data from COLA (comoving Lagrangian acceleration) simulations in the normal branch of DGP gravity (nDGP) and general relativity (GR). Using COLA for these comparisons is validated using a suite of full N-body simulations for the same theories. The two theoretical templates correspond to the standard general relativistic perturbation equations and those same equations modeled within nDGP. Gravitational clustering nonlinear effects are accounted for by modeling the power spectrum up to one-loop order and redshift space clustering anisotropy is modeled using the Taruya, Nishimichi and Saito (TNS) RSD model. Using this approach, we attempt to recover the simulation's fiducial logarithmic growth parameter f. By assigning the simulation data with errors representing an idealized survey with a volume of 10 Gpc(3)/ h(3), we find the GR template is unable to recover fiducial f to within 1 sigma at z = 1 when we match the data up to k(max) = 0.195h/Mpc. On the other hand, the DGP template recovers the fiducial value within 1s. Further, we conduct the same analysis for sets of mock data generated for generalized models of modified gravity using SPT, where again we analyze the GR template's ability to recover the fiducial value. We find that for models with enhanced gravitational nonlinearity, the theoretical bias of the GR template becomes significant for stage IV surveys. Thus, we show that for the future large data volume galaxy surveys, the self-consistent modeling of non-GR gravity scenarios will be crucial in constraining theory parameters.
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]	MATTER POWER SPECTRUM ; REDSHIFT-SPACE DISTORTIONS ; LARGE-SCALE STRUCTURE ; CLUSTERING WEDGES ; MODIFIED GRAVITY ; F(R) GRAVITY ; PERTURBATION-THEORY ; CONSTANT PROBLEM ; FULL SHAPE ; REAL-SPACE
收录类别	SCI
语种	英语
WOS记录号	WOS:000405712900002
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8871]
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, Ul Szafrana 2, PL-65516 Zielona Gora, Poland 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Bose, Benjamin,Koyama, Kazuya,Hellwing, Wojciech A.,et al. Theoretical accuracy in cosmological growth estimation[J]. PHYSICAL REVIEW D,2017,96(2).
APA	Bose, Benjamin,Koyama, Kazuya,Hellwing, Wojciech A.,Zhao, Gong-Bo,&Winther, Hans A..(2017).Theoretical accuracy in cosmological growth estimation.PHYSICAL REVIEW D,96(2).
MLA	Bose, Benjamin,et al."Theoretical accuracy in cosmological growth estimation".PHYSICAL REVIEW D 96.2(2017).