Modified Lyth bound and implications of BICEP2 results
文献类型：期刊论文
| 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 |
| 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. |
| 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. |
| 学科主题 | Astronomy & Astrophysics ; Physics |
| 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 |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/21067]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | Gao, Q,Gong, YG,Li, TJ. Modified Lyth bound and implications of BICEP2 results[J]. PHYSICAL REVIEW D,2015,91(6):63509. |
| APA | Gao, Q,Gong, YG,&Li, TJ.(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. |
入库方式： OAI收割
来源：理论物理研究所
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