Gravitational Waves Induced by Non-Gaussian Scalar Perturbations

doi:10.1103/PhysRevLett.122.201101

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	Gravitational Waves Induced by Non-Gaussian Scalar Perturbations
	Cai, RG ; Pi, S 4; Sasaki, M 1,4,5
刊名	PHYSICAL REVIEW LETTERS
	2019
卷号	122 期号:20
关键词	BLACK-HOLE FORMATION INFLATION RADIATION EVOLUTION
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.122.201101
英文摘要	We study gravitational waves (GWs) induced by non-Gaussian curvature perturbations. We calculate the density parameter per logarithmic frequency interval, Omega(GW)(k), given that the power spectrum of the curvature perturbation P-R(k) has a narrow peak at some small scale k(), with a local-type non-Gaussianity, and constrain the nonlinear parameter f(NL) with the future LISA sensitivity curve as well as with constraints from the abundance of the primordial black holes (PBHs). We find that the non-Gaussian contribution to Omega(GW) increases as k(3), peaks at k/k() = 4/root 3, and has a sharp cutoff at k = 4k(*). The non-Gaussian part can exceed the Gaussian part if P-R(k)f(NL)(2) greater than or similar to 1. If both a slope Omega(GW)(k) alpha k(beta) with beta similar to 3 and the multiple-peak structure around a cutoff are observed, it can be recognized as a smoking gun of the primordial non-Gaussianity. We also find that if PBHs with masses of 10(20) to 10(22) g are identified as cold dark matter of the Universe, the corresponding GWs must be detectable by LISA-like detectors, irrespective of the value of P-R or f(NL).
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23428]
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.Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan 2.Natl Taiwan Univ, Leung Ctr Cosmol & Particle Astrophys, Taipei 10617, Taiwan 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 5.Kavli Inst Phys & Math Universe WPI, Chiba 2778583, Japan
推荐引用方式 GB/T 7714	Cai, RG,Pi, S,Sasaki, M. Gravitational Waves Induced by Non-Gaussian Scalar Perturbations[J]. PHYSICAL REVIEW LETTERS,2019,122(20).
APA	Cai, RG,Pi, S,&Sasaki, M.(2019).Gravitational Waves Induced by Non-Gaussian Scalar Perturbations.PHYSICAL REVIEW LETTERS,122(20).
MLA	Cai, RG,et al."Gravitational Waves Induced by Non-Gaussian Scalar Perturbations".PHYSICAL REVIEW LETTERS 122.20(2019).