Principal component analysis of the reionization history from Planck 2015 data

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	Principal component analysis of the reionization history from Planck 2015 data
	Dai, WM; Guo, ZK; Cai, RG
刊名	PHYSICAL REVIEW D
	2015
卷号	92 期号:12 页码:123521
通讯作者	Dai, WM (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
英文摘要	The simple assumption of an instantaneous reionization of the Universe may bias estimates of cosmological parameters. In this paper a model-independent principal component method for the reionization history is applied to give constraints on the cosmological parameters from recent Planck 2015 data. We find that the Universe is not completely reionized at redshifts z >= 8.5 at 95% C.L. Both the reionization optical depth and matter fluctuation amplitude are higher than but consistent with those obtained in the standard instantaneous reionization scheme. The high estimated value of the matter fluctuation amplitude strengthens the tension between Planck cosmic microwave background observations and some astrophysical data, such as cluster counts and weak lensing. The tension can be significantly relieved if the neutrino masses are allowed to vary. Thanks to a high scalar spectral index, the low-scale spontaneously broken supersymmetry inflationary model can fit the data well, which is marginally disfavored at 95% C.L. in the Planck analysis.
学科主题	Astronomy & Astrophysics ; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
关键词[WOS]	MICROWAVE BACKGROUND ANISOTROPIES ; POLARIZATION ; CONSTRAINTS ; UNIVERSE ; MODELS
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/20748]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Dai, WM,Guo, ZK,Cai, RG. Principal component analysis of the reionization history from Planck 2015 data[J]. PHYSICAL REVIEW D,2015,92(12):123521.
APA	Dai, WM,Guo, ZK,&Cai, RG.(2015).Principal component analysis of the reionization history from Planck 2015 data.PHYSICAL REVIEW D,92(12),123521.
MLA	Dai, WM,et al."Principal component analysis of the reionization history from Planck 2015 data".PHYSICAL REVIEW D 92.12(2015):123521.