Reducing the tension between the BICEP2 and the Planck measurements: A complete exploration of the parameter space
文献类型：期刊论文
| 作者 | Li, Yi-Chao1,2 ; Wu, Feng-Quan1; Lu, You-Jun1; Chen, Xue-Lei1,3
|
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2014-11-10 |
| 卷号 | 738页码:206-212 |
| 关键词 | BICEP2 B-mode Neutrinos Sterile neutrinos |
| 英文摘要 | A large inflationary tensor-to-scalar ratio r(0.002) = 0.20(-0.05)(+0.07) is reported by the BICEP2 team based on their B-mode polarization detection, which is outside of the 95% confidence level of the Planck best fit model. We explore several possible ways to reduce the tension between the two by considering a model in which alpha(s), n(t), n(s) and the neutrino parameters N-eff and Sigma m(nu) are set as free parameters. Using the Markov Chain Monte Carlo (MCMC) technique to survey the complete parameter space with and without the BICEP2 data, we find that the resulting constraints on r(0.002) are consistent with each other and the apparent tension seems to be relaxed. Further detailed investigations on those fittings suggest that N-eff probably plays the most important role in reducing the tension. We also find that the results obtained from fitting without adopting the consistency relation do not deviate much from the consistency relation. With available Planck, WMAP, BICEP2 and BAO data sets altogether, we obtain r(0.002) = 0.14(-0.11)(+0.05), n(t) = 0.35(-0.47)(+0.28), n(s) = 0.98(-0.02)(+0.02), and alpha(s) = -0.0086(-0.0189)(+0.0148); if the consistency relation is adopted, we get r(0.002) = 0.22(-0.06)(+0.05). (C) 2014 The Authors. Published by Elsevier B.V. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000344624900033 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6389]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Yi-Chao,Wu, Feng-Quan,Lu, You-Jun,et al. Reducing the tension between the BICEP2 and the Planck measurements: A complete exploration of the parameter space[J]. PHYSICS LETTERS B,2014,738:206-212. |
| APA | Li, Yi-Chao,Wu, Feng-Quan,Lu, You-Jun,&Chen, Xue-Lei.(2014).Reducing the tension between the BICEP2 and the Planck measurements: A complete exploration of the parameter space.PHYSICS LETTERS B,738,206-212. |
| MLA | Li, Yi-Chao,et al."Reducing the tension between the BICEP2 and the Planck measurements: A complete exploration of the parameter space".PHYSICS LETTERS B 738(2014):206-212. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。