Knowledge Management System of Institute of Theoretical Physics, CAS
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.
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| Principal component analysis of the reionization history from Planck 2015 data | |
| Source Publication | PHYSICAL REVIEW D
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| Language | 英语 |
| Abstract | 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 | |
| Volume | 92Issue:12Pages:123521 |
| Subject Area | Astronomy & Astrophysics ; Physics |
| DOI | http://dx.doi.org/10.1103/PhysRevD.92.123521 |
| Indexed By | SCI |
| Funding Organization | 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] |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/20748 |
| Collection | 理论物理所科研产出_SCI论文 |
| Corresponding Author | Dai, 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Principal component （416KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | Application Full Text | |
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