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Dai, WM; Guo, ZK; Cai, RG; Dai, WM (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
Principal component analysis of the reionization history from Planck 2015 data
Source PublicationPHYSICAL REVIEW D
Language英语
AbstractThe 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.
2015
Volume92Issue:12Pages:123521
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.92.123521
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11175225, 11335012] ; National Natural Science Foundation of China [11175225, 11335012] ; National Natural Science Foundation of China [11175225, 11335012] ; National Natural Science Foundation of China [11175225, 11335012] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB09000000]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/20748
Collection理论物理所科研产出_SCI论文
Corresponding AuthorDai, WM (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Dai, WM,Guo, ZK,Cai, RG,et al. 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,&Dai, WM .(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.
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