Constraints on parameterized dark energy properties from new observations with principal component analysis

doi:10.1016/j.astropartphys.2016.10.005

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	Constraints on parameterized dark energy properties from new observations with principal component analysis
	Li H(李虹); Zheng W(郑伟); Li, H; Zheng, W
刊名	ASTROPARTICLE PHYSICS
	2017
卷号	86 页码:1-10
关键词	Dark energy EoS Observations
ISSN号	0927-6505
DOI	10.1016/j.astropartphys.2016.10.005
文献子类	Article
英文摘要	For dark energy, the equation of state (EoS) is a critical parameter to depict its physical properties. In this paper, we mainly give constraints on the EoS of dark energy w with the latest observations of cosmic microwave background radiation (CMB) from Planck satellite, JLA Type la supernovae (SNIa) sample, baryon acoustic oscillation (BAO) and Hubble parameter measurements. We introduce a kind of parameterized dark energy model called "constant bin - w", in which the whole redshift range is divided into several bins, and EoS w in each bin is assumed as an independent constant. The results show that EoS in all of the redshift bins are comparable with Lambda CDM in the 2 sigma confidence regions, but some weak deviations from w = -1 are still indicated. In particular, in the framework of 7 bins, a slight oscillation behavior is shown in the redshift 0 < z < 0.75, especially around the range of 4th bin (0.25 < z < 0.35) and 5th bin (0.35 < z < 0.51). Additionally, we adopt the principal component analysis (PCA) method to do the model-independent analysis, which includes normal PCA and localized PCA methods. By implementing so called normal PCA method, the original oscillation behavior of EoS indicated in the framework of 7 bins becomes more significant after the best reconstruction, but such result still supports Lambda CDM within the margin of 2 sigma errors. To further reduce the errors of constraints on EoS, and confirm such deviations from the cosmological constant scenario, we hope for more precise observational data in the future. (C) 2016 Elsevier B.V. All rights reserved.
电子版国际标准刊号	1873-2852
WOS关键词	BARYON ACOUSTIC-OSCILLATIONS ; LUMINOUS RED GALAXIES ; EQUATION-OF-STATE ; COSMOLOGICAL CONSEQUENCES ; SUPERNOVA ; CONSTANT ; SAMPLES
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000390512000001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284374]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Li H,Zheng W,Li, H,et al. Constraints on parameterized dark energy properties from new observations with principal component analysis[J]. ASTROPARTICLE PHYSICS,2017,86:1-10.
APA	李虹,郑伟,Li, H,&Zheng, W.(2017).Constraints on parameterized dark energy properties from new observations with principal component analysis.ASTROPARTICLE PHYSICS,86,1-10.
MLA	李虹,et al."Constraints on parameterized dark energy properties from new observations with principal component analysis".ASTROPARTICLE PHYSICS 86(2017):1-10.