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题名: Modified Lyth bound and implications of BICEP2 results
作者: Gao, Q;  Gong, YG;  Li, TJ
刊名: PHYSICAL REVIEW D
出版日期: 2015
卷号: 91, 期号:6, 页码:63509
学科分类: Astronomy & Astrophysics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.91.063509
通讯作者: Gong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Peoples R China.
文章类型: Article
英文摘要: To reconcile the BICEP2 measurement on the tensor-to-scalar ratio r with Planck constraint, a large negative running of scalar spectral index n(s) is needed. So the inflationary observable such as ns should be expanded at least to the second-order slow-roll parameters for single-field inflationary models. The large value of r and the Lyth bound indicate that it is impossible to obtain the sub-Planckian excursion for the inflaton. However, we derive an absolutely minimal bound Delta phi/M-PI > root r/2 on the inflaton excursion for single-field inflationary models, which can be applied to non-slow-roll inflationary models as well. This bound excludes the possibility of the small-field inflation with Delta phi < 0.1M(P1) if the BICEP2 result on r stands, and it opens the window of sub-Planckian excursion with Delta phi < M-P1, even if r is as large as 0.1. To get the sub-Planckian excursion with Delta phi < 0.1M(P1), our modified bound requires r < 0.02. Using a fifth-order polynomial potential as an explicit example, we show that it not only agrees with the observational results, but also violates the Lyth bound.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: SINGLE FIELD INFLATION ;  NO-SCALE SUPERGRAVITY ;  CHAOTIC INFLATION ;  DENSITY PERTURBATION ;  GRAVITATIONAL-WAVE ;  HYBRID INFLATION ;  POWER SPECTRUM ;  PLANCK ;  MODELS ;  UNIVERSE
收录类别: SCI
项目资助者: Natural Science Foundation of China [10821504, 11075194, 11135003, 11175270, 11275246, 11475065, 11475238] ;  National Basic Research Program of China (973 Program) [2010CB833000] ;  Program for New Century Excellent Talents in University [NCET-12-0205] ;  Fundamental Research Funds for the Central Universities [2013YQ055]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21067
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Recommended Citation:
Gao, Q,Gong, YG,Li, TJ. Modified Lyth bound and implications of BICEP2 results[J]. PHYSICAL REVIEW D,2015,91(6):63509.
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