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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.
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| Modified Lyth bound and implications of BICEP2 results | |
| Source Publication | PHYSICAL REVIEW D
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| Language | 英语 |
| Abstract | 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. |
| 2015 | |
| Volume | 91Issue:6Pages:63509 |
| Subject Area | Astronomy & Astrophysics ; Physics |
| DOI | http://dx.doi.org/10.1103/PhysRevD.91.063509 |
| Indexed By | SCI |
| Funding Organization | 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] ; 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] |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/21067 |
| Collection | SCI期刊论文 |
| Corresponding Author | Gong, 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Modified Lyth bound （315KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | Application Full Text | |
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