Testing backreaction effects with observational Hubble parameter data

doi:10.1140/epjc/s10052-018-5616-4

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	Testing backreaction effects with observational Hubble parameter data
	Cao, Shu-Lei 3; Teng, Huan-Yu 3; Wan, Hao-Yi 3,4; Yu, Hao-Ran 1; Zhang, Tong-Jie 2,3
刊名	EUROPEAN PHYSICAL JOURNAL C
	2018-02-26
卷号	78 期号:2 页码:11
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-018-5616-4
英文摘要	The spatially averaged inhomogeneous Universe includes a kinematical backreaction term Q(D) that is relate to the averaged spatial Ricci scalar < R >(D) in the framework of general relativity. Under the assumption that Q(D) and < R >(D) obey the scaling laws of the volume scale factor a(D), a direct coupling between them with a scaling index n is remarkable. In order to explore the generic properties of a backreaction model for explaining the accelerated expansion of the Universe, we exploit two metrics to describe the late time Universe. Since the standard FLRW metric cannot precisely describe the late time Universe on small scales, the template metric with an evolving curvature parameter kappa(D)(t) is employed. However, we doubt the validity of the prescription for kappa(D), which motivates us apply observational Hubble parameter data (OHD) to constrain parameters in dust cosmology. First, for FLRW metric, by getting best-fit constraints of Omega(D0)(m) = 0.25(-0.03)(+0.03), n = 0.02(-0.66)(+0.69), and H-D0 = 70.54(-3.97)(+4.24) km s(-1) Mpc(-1), the evolutions of parameters are explored. Second, in template metric context, by marginalizing over H-D0 as a prior of uniform distribution, we obtain the best-fit values of n = -1.22(-0.41)(+0.68) and Omega(D0)(m) = 0.12(-0.02)(+0.04). Moreover, we utilize three different Gaussian priors of H-D0, which result in different best-fits of n, but almost the same best-fit value of Omega(D0)(m) similar to 0.12. Also, the absolute constraints without marginalization of parameter are obtained: n = -1.1(-0.50)(+0.58) and Omega(D0)(m) = 0.13 +/- 0.03. With these constraints, the evolutions of the effective deceleration parameter q(D) indicate that the backreaction can account for the accelerated expansion of the Universe without involving extra dark energy component in the scaling solution context. Nevertheless, the results also verify that the prescription of kappa(D) is insufficient and should be improved.
资助项目	National Science Foundation of China[11573006] ; National Science Foundation of China[11528306] ; Key R&D Program of China[2017YFA0402600] ; Fundamental Research Funds for the Central Universities ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund
WOS关键词	DARK ENERGY ; GENERAL-RELATIVITY ; CONSTRAINTS ; COSMOLOGIES ; SUPERNOVAE ; CONSTANT ; GALAXIES ; LAMBDA
WOS研究方向	Physics
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000426485000002
资助机构	National Science Foundation of China ; National Science Foundation of China ; Key R&D Program of China ; Key R&D Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; National Science Foundation of China ; National Science Foundation of China ; Key R&D Program of China ; Key R&D Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; National Science Foundation of China ; National Science Foundation of China ; Key R&D Program of China ; Key R&D Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; National Science Foundation of China ; National Science Foundation of China ; Key R&D Program of China ; Key R&D Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund ; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37229]
专题	中国科学院国家天文台
通讯作者	Zhang, Tong-Jie
作者单位	1.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, 800 Dongchuan Rd, Shanghai 200240, Peoples R China 2.Dezhou Univ, Dezhou 253023, Peoples R China 3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Cao, Shu-Lei,Teng, Huan-Yu,Wan, Hao-Yi,et al. Testing backreaction effects with observational Hubble parameter data[J]. EUROPEAN PHYSICAL JOURNAL C,2018,78(2):11.
APA	Cao, Shu-Lei,Teng, Huan-Yu,Wan, Hao-Yi,Yu, Hao-Ran,&Zhang, Tong-Jie.(2018).Testing backreaction effects with observational Hubble parameter data.EUROPEAN PHYSICAL JOURNAL C,78(2),11.
MLA	Cao, Shu-Lei,et al."Testing backreaction effects with observational Hubble parameter data".EUROPEAN PHYSICAL JOURNAL C 78.2(2018):11.