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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
发表期刊PHYSICAL REVIEW D
语种英语
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.
2015
卷号92期号:12页码:123521
学科领域Astronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.92.123521
收录类别SCI
项目资助者National 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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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/20748
专题理论物理所科研产出_SCI论文
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.
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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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