Intermittent null energy condition violations during inflation and primordial gravitational waves

doi:10.1103/PhysRevD.103.083521

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	Intermittent null energy condition violations during inflation and primordial gravitational waves
	Cai, Yong ; Piao, Yun-Song
刊名	PHYSICAL REVIEW D
	2021
卷号	103 期号:8 页码:83521
关键词	TRANS-PLANCKIAN CENSORSHIP MODELS STATE
ISSN号	2470-0010
DOI	10.1103/PhysRevD.103.083521
英文摘要	Primordial null energy condition (NEC) violation would imprint a blue-tilted spectrum on gravitational wave background (GWB). However, its implications on the GWB might be far richer than expected. We present a scenario, in which after a slow-roll (NEC-preserving) inflation with Hubble parameter H similar or equal to H-in(f1), the Universe goes through an NEC-violating period and then enters subsequent slow-roll inflation with a higher H (= H-in(f2) >> H-inf1). The resulting primordial gravitational wave spectrum is nearly flat at the cosmic microwave background band, as well as at the frequency f similar to 1/yr but with higher amplitude (compatible with the recent NANOGrav result). It is also highlighted that for the multistage inflation if the NEC violations happened intermittently, we might have a Great Wall-like spectrum of the stochastic GWB at the corresponding frequency band.
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/311006/27367]
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.Zhengzhou Univ, Sch Phys & Microelect, Zhengzhou 450001, Henan, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China 3.UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China 4.Int Ctr Theoret Phys Asia Pacific, Beijing 100190, Peoples R China 5.Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Cai, Yong,Piao, Yun-Song. Intermittent null energy condition violations during inflation and primordial gravitational waves[J]. PHYSICAL REVIEW D,2021,103(8):83521.
APA	Cai, Yong,&Piao, Yun-Song.(2021).Intermittent null energy condition violations during inflation and primordial gravitational waves.PHYSICAL REVIEW D,103(8),83521.
MLA	Cai, Yong,et al."Intermittent null energy condition violations during inflation and primordial gravitational waves".PHYSICAL REVIEW D 103.8(2021):83521.