.png){kind=icon}
返回
Transplanckian axions!?
.png){kind=icon}
OA
AI
DOI：10.1007/JHEP08(2015)032.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
We discuss quantum gravitational effects in Einstein theory coupled to periodic axion scalars to analyze the viability of several proposals to achieve superplanckian axion periods (aka decay constants) and their possible application to large field inflation models. The effects we study correspond to the nucleation of euclidean gravitational instantons charged under the axion, and our results are essentially compatible with (but independent of) the Weak Gravity Conjecture, as follows: single axion theories with superplanckian periods contain gravitational instantons inducing sizable higher harmonics in the axion potential, which spoil superplanckian inflaton field range. A similar result holds for multiaxion models with lattice alignment (like the Kim-Nilles-Peloso model). Finally, theories with N axions can still achieve a moderately superplanckian periodicity (by a root N factor) with no higher harmonics in the axion potential. The Weak Gravity Conjecture fails to hold in this case due to the absence of some instantons, which are forbidden by a discrete Z(N) gauge symmetry. Finally we discuss the realization of these instantons as euclidean D-branes in string compactifications.
Keyword:
Black Holes in String Theory
D-branes
Models of Quantum Gravity
Global Symmetries
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
5.5
论文数:
3.9W
被引数:
13.7W
机构
引用论文
.png){kind=icon}
分享收藏分享收藏分享收藏
查看更多内容