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

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

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....

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Main Authors: Hao-Hao Li, Gen Ye, Yun-Song Piao
Format: Article
Language:English
Published: Elsevier 2021-05-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269321001519
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spelling doaj-a4bcd1884bf9438e9391c367eb74424d2021-03-22T12:35:40ZengElsevierPhysics Letters B0370-26932021-05-01816136211Is the NANOGrav signal a hint of dS decay during inflation?Hao-Hao Li0Gen Ye1Yun-Song Piao2School of Physics, University of Chinese Academy of Sciences, Beijing 100049, ChinaSchool of Physics, University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding author.School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China; Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China; School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; International Center for Theoretical Physics Asia-Pacific, Beijing/Hangzhou, ChinaThe 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.http://www.sciencedirect.com/science/article/pii/S0370269321001519
collection DOAJ
language English
format Article
sources DOAJ
author Hao-Hao Li
Gen Ye
Yun-Song Piao
spellingShingle Hao-Hao Li
Gen Ye
Yun-Song Piao
Is the NANOGrav signal a hint of dS decay during inflation?
Physics Letters B
author_facet Hao-Hao Li
Gen Ye
Yun-Song Piao
author_sort Hao-Hao Li
title Is the NANOGrav signal a hint of dS decay during inflation?
title_short Is the NANOGrav signal a hint of dS decay during inflation?
title_full Is the NANOGrav signal a hint of dS decay during inflation?
title_fullStr Is the NANOGrav signal a hint of dS decay during inflation?
title_full_unstemmed Is the NANOGrav signal a hint of dS decay during inflation?
title_sort is the nanograv signal a hint of ds decay during inflation?
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2021-05-01
description 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.
url http://www.sciencedirect.com/science/article/pii/S0370269321001519
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AT genye isthenanogravsignalahintofdsdecayduringinflation
AT yunsongpiao isthenanogravsignalahintofdsdecayduringinflation
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