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题名: Constraints on single-field inflation with WMAP, SPT and ACT data - a last-minute stand before Planck
作者: Cheng, C ;  Huang, QG ;  Ma, YZ
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2013
期号: 7, 页码:18
关键词: BARYON ACOUSTIC-OSCILLATIONS ;  QUANTUM CORRECTIONS ;  HUBBLE CONSTANT ;  FLATNESS ;  UNIVERSE ;  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] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Cheng, Cheng] Univ Chinese Acad Sci, Beijing 100190, 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 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.
资助者: Knowledge Innovation Program of Chinese Academy of Science; NSFC [10821504]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000322582000019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15329
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Recommended Citation:
Cheng, C,Huang, QG,Ma, YZ. 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.
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