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Cheng, C; Huang, QG; Li, XD; Ma, YZ; Cheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Constraints on primordial gravitational waves with variable sound speed from current CMB data
发表期刊PHYSICAL REVIEW D
语种英语
关键词Probe Wmap Observations Observations Cosmological Interpretation Polarization Power Spectra Inflationary Universe Anisotropy Temperature Flatness Horizon
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
2012
ISSN1550-7998
卷号86期号:12页码:123512
学科领域Physics
收录类别SCI
项目资助者Innovation Program of Chinese Academy of Science; NSFC [10975167] ; Innovation Program of Chinese Academy of Science; NSFC [10975167] ; Innovation Program of Chinese Academy of Science; NSFC [10975167] ; Innovation Program of Chinese Academy of Science; NSFC [10975167]
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/14955
专题理论物理所科研产出_SCI论文
通讯作者Cheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
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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.
APA Cheng, C,Huang, QG,Li, XD,Ma, YZ,&Cheng, C .(2012).Constraints on primordial gravitational waves with variable sound speed from current CMB data.PHYSICAL REVIEW D,86(12),123512.
MLA Cheng, C,et al."Constraints on primordial gravitational waves with variable sound speed from current CMB data".PHYSICAL REVIEW D 86.12(2012):123512.
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