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题名: Principal component analysis of the reionization history from Planck 2015 data
作者: Dai, WM;  Guo, ZK;  Cai, RG
刊名: PHYSICAL REVIEW D
出版日期: 2015
卷号: 92, 期号:12, 页码:123521
学科分类: Astronomy & Astrophysics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.92.123521
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.
文章类型: Article
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.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: MICROWAVE BACKGROUND ANISOTROPIES ;  POLARIZATION ;  CONSTRAINTS ;  UNIVERSE ;  MODELS
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11175225, 11335012] ;  Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09000000]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20748
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Recommended Citation:
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.
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