Constraints on primordial gravitational waves with variable sound speed from current CMB data
文献类型：期刊论文
| 作者 | Huang, QG
|
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2012 |
| 卷号 | 86期号:12页码:123512 |
| 关键词 | PROBE WMAP OBSERVATIONS OBSERVATIONS COSMOLOGICAL INTERPRETATION POLARIZATION POWER SPECTRA INFLATIONARY UNIVERSE ANISOTROPY TEMPERATURE FLATNESS HORIZON |
| ISSN号 | 1550-7998 |
| 通讯作者 | Cheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China. |
| 英文摘要 | We make a comprehensive investigation of the observational effect of the inflation consistency relation. We focus on the general single-field inflation model with the consistency relation r = -8c(s)n(t), and investigate the observational constraints of sound speed c(s) by using the seven-year WMAP data, the background imaging of cosmic extragalactic polarization tensor power spectrum data, and the constraints on non-Gaussian parameters f(NL)(equil) and f(NL)(orth) from the five-year WMAP observations. We find that the constraints on the tensor-to-scalar ratio r is much tighter if c(s) is small, since a large tilt n(t) is strongly constrained by the observations. We obtain r < 0.37, 0.27, and 0.09 (dn(s)/d lnk = 0) for c(s) = 1, 0.1, and 0.01 models at 95.4% confidence level (CL). When taking smaller values of c(s), the positive correlation between r and n(s) also leads to a slightly tighter constraint on the upper bound of n(s), while the running of scalar spectral index dn(s)/d lnk is generally unaffected. For the sound speed c(s), it is not well constrained if only the cosmic microwave background power spectrum data is used, while the constraints are obtainable by taking f(NL)(equil) and f(NL)(orth) priors into account. With the constraining data of f(NL)(equil) and f(NL)(orth), we find that, c(s) less than or similar to 0.01 region is excluded at 99.7% CL, and the c(s) = 1 case (the single-field slow-roll inflation) is slightly disfavored at 68.3% CL. In addition, the inclusion of f(NL)(equil.) and f(NL)(orth.) into the analysis can improve the constraints on r and n(s). We further discuss the implications of our constraints on the test of inflation models. DOI: 10.1103/PhysRevD.86.123512 |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | Innovation Program of Chinese Academy of Science; NSFC [10975167] |
| 原文出处 | http://dx.doi.org/10.1103/PhysRevD.86.123512 |
| 语种 | 英语 |
| WOS记录号 | WOS:000312029200004 |
| 公开日期 | 2014-04-24 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/14955]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | Huang, QG. Constraints on primordial gravitational waves with variable sound speed from current CMB data[J]. PHYSICAL REVIEW D,2012,86(12):123512. |
| APA | Huang, QG.(2012).Constraints on primordial gravitational waves with variable sound speed from current CMB data.PHYSICAL REVIEW D,86(12),123512. |
| MLA | Huang, QG."Constraints on primordial gravitational waves with variable sound speed from current CMB data".PHYSICAL REVIEW D 86.12(2012):123512. |
入库方式： OAI收割
来源：理论物理研究所
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