Is the NANOGrav signal a hint of dS decay during inflation?
Li, Hao-Hao; Ye, Gen; Piao, Yun-Song
刊名PHYSICS LETTERS B
2021
卷号816页码:136211
关键词GRAVITATIONAL-RADIATION VACUUM WAVES PROBE
ISSN号0370-2693
DOI10.1016/j.physletb.2021.136211
英文摘要The NANOGrav collaboration recently has reported evidence for a stochastic common-spectrum process in its 12.5 yr dataset. We show that such a signal might be a hint of de Sitter (dS) decay during inflation. As suggested by the swampland conjectures, dS space is highly unstable if it exists at all. During inflation, the short-lived dS states will decay through a cascade of first-order phase transitions (PT). We find that the gravitational waves (GWs) yielded by such a PT will be "reddened" by subsequent dS expansion, which may result in a slightly red-tilt stochastic GW background at the low-frequency band, compatible with the NANOGrav 12.5 yr result. (C) 2021 The Author(s). Published by Elsevier B.V.
学科主题Astronomy & Astrophysics ; Physics
语种英语
内容类型期刊论文
源URL[http://ir.itp.ac.cn/handle/311006/27368]  
专题理论物理研究所_理论物理所1978-2010年知识产出
作者单位1.[Li, Hao-Hao
2.Ye, Gen
3.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China
5.UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
6.Internat Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China
推荐引用方式
GB/T 7714
Li, Hao-Hao,Ye, Gen,Piao, Yun-Song. Is the NANOGrav signal a hint of dS decay during inflation?[J]. PHYSICS LETTERS B,2021,816:136211.
APA Li, Hao-Hao,Ye, Gen,&Piao, Yun-Song.(2021).Is the NANOGrav signal a hint of dS decay during inflation?.PHYSICS LETTERS B,816,136211.
MLA Li, Hao-Hao,et al."Is the NANOGrav signal a hint of dS decay during inflation?".PHYSICS LETTERS B 816(2021):136211.
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