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Cheng, C; Huang, QG; Ma, YZ; Cheng, C (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
Constraints on single-field inflation with WMAP, SPT and ACT data - a last-minute stand before Planck
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordBaryon Acoustic-oscillations Quantum Corrections Hubble Constant Flatness Universe Horizon
AbstractWe constrain models of single field inflation with the pre-Planck CMB data. The data used here is the 9-year Wilkinson Microwave Anisotropy Probe (WMAP) data, South Pole Telescope (SPT) data and Atacama Cosmology Telescope (ACT) data. By adding in running of spectral index parameter, we find that the chi(2) is improved by a factor of Delta chi(2) = 8.44, which strongly indicates the preference of this parameter from current data. In addition, we find that the running of spectral index as does not change very much even if we switch to different pivot scales, which suggests that the power law expansion of power spectrum is accurate enough till the 1st order term. Furthermore, we find that the joint constraints on r - n(s) give very tight constraints on single-field inflation models, and the models with power law potential empty set(p) can only survive if 0.9 less than or similar to p less than or similar to 2.1, so a large class of inflation models have already been ruled out before Planck data. Finally, we use the f(NL) data to constrain the non-trivial sound speed c(s). We find that the current constraint is dominated by the power spectrum constraints which have some inconsistency with the constraints from f(NL). This poses important questions of consistency between power spectrum and bispectrum of WMAP data.
2013
ISSN1475-7516
Issue7Pages:18
Subject AreaPhysics
Indexed BySCI
Funding OrganizationKnowledge Innovation Program of Chinese Academy of Science; NSFC [10821504] ; Knowledge Innovation Program of Chinese Academy of Science; NSFC [10821504] ; Knowledge Innovation Program of Chinese Academy of Science; NSFC [10821504] ; Knowledge Innovation Program of Chinese Academy of Science; NSFC [10821504]
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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/311006/15329
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,Ma, YZ,et al. Constraints on single-field inflation with WMAP, SPT and ACT data - a last-minute stand before Planck[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(7):18.
APA Cheng, C,Huang, QG,Ma, YZ,&Cheng, C .(2013).Constraints on single-field inflation with WMAP, SPT and ACT data - a last-minute stand before Planck.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(7),18.
MLA Cheng, C,et al."Constraints on single-field inflation with WMAP, SPT and ACT data - a last-minute stand before Planck".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .7(2013):18.
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