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Gao, Q; Gong, YG; Li, TJ; Gong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Peoples R China.
Modified Lyth bound and implications of BICEP2 results
Source PublicationPHYSICAL REVIEW D
Language英语
AbstractTo 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.
2015
Volume91Issue:6Pages:63509
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.91.063509
Indexed BySCI
Funding OrganizationNatural Science Foundation of China [10821504, 11075194, 11135003, 11175270, 11275246, 11475065, 11475238] ; Natural Science Foundation of China [10821504, 11075194, 11135003, 11175270, 11275246, 11475065, 11475238] ; Natural Science Foundation of China [10821504, 11075194, 11135003, 11175270, 11275246, 11475065, 11475238] ; Natural Science Foundation of China [10821504, 11075194, 11135003, 11175270, 11275246, 11475065, 11475238] ; National Basic Research Program of China (973 Program) [2010CB833000] ; National Basic Research Program of China (973 Program) [2010CB833000] ; National Basic Research Program of China (973 Program) [2010CB833000] ; National Basic Research Program of China (973 Program) [2010CB833000] ; Program for New Century Excellent Talents in University [NCET-12-0205] ; Program for New Century Excellent Talents in University [NCET-12-0205] ; Program for New Century Excellent Talents in University [NCET-12-0205] ; Program for New Century Excellent Talents in University [NCET-12-0205] ; Fundamental Research Funds for the Central Universities [2013YQ055] ; Fundamental Research Funds for the Central Universities [2013YQ055] ; Fundamental Research Funds for the Central Universities [2013YQ055] ; Fundamental Research Funds for the Central Universities [2013YQ055]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21067
Collection理论物理所科研产出_SCI论文
Corresponding AuthorGong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Peoples R China.
Recommended Citation
GB/T 7714
Gao, Q,Gong, YG,Li, TJ,et al. Modified Lyth bound and implications of BICEP2 results[J]. PHYSICAL REVIEW D,2015,91(6):63509.
APA Gao, Q,Gong, YG,Li, TJ,&Gong, YG .(2015).Modified Lyth bound and implications of BICEP2 results.PHYSICAL REVIEW D,91(6),63509.
MLA Gao, Q,et al."Modified Lyth bound and implications of BICEP2 results".PHYSICAL REVIEW D 91.6(2015):63509.
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