Is the NANOGrav signal a hint of dS decay during inflation?

被引：26
|
作者：
Li, Hao-Hao [1 ]
Ye, Gen [1 ]
Piao, Yun-Song [1 ,2 ,3 ,4 ]
机构：
[1] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
[2] Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China
[3] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
[4] Internat Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China
来源：
PHYSICS LETTERS B | 2021年 / 816卷
关键词：
GRAVITATIONAL-RADIATION; VACUUM; WAVES; PROBE;
D O I：
10.1016/j.physletb.2021.136211
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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.
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页数：6
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