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题名: Constraints on primordial gravitational waves with variable sound speed from current CMB data
作者: Cheng, C ;  Huang, QG ;  Li, XD ;  Ma, YZ
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
学科分类: Physics
通讯作者: Cheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Cheng, Cheng; Huang, Qing-Guo; Li, Xiao-Dong] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Li, Xiao-Dong] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China; [Ma, Yin-Zhe] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada; [Ma, Yin-Zhe] Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada
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
资助者: Innovation Program of Chinese Academy of Science; NSFC [10975167]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000312029200004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14955
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Cheng, C,Huang, QG,Li, XD,et al. Constraints on primordial gravitational waves with variable sound speed from current CMB data[J]. PHYSICAL REVIEW D,2012,86(12):123512.
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