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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
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordProbe Wmap Observations Observations Cosmological Interpretation Polarization Power Spectra Inflationary Universe Anisotropy Temperature Flatness Horizon
AbstractWe 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
Volume86Issue:12Pages:123512
Subject AreaPhysics
Indexed BySCI
Funding OrganizationInnovation 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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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/14955
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
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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