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Cai, RG; Pi, S2; Sasaki, M2,3,4 | |
Gravitational Waves Induced by Non-Gaussian Scalar Perturbations | |
Source Publication | PHYSICAL REVIEW LETTERS |
Language | 英语 |
Keyword | BLACK-HOLE FORMATION INFLATION RADIATION EVOLUTION |
Abstract | 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). |
2019 | |
ISSN | 0031-9007 |
Volume | 122Issue:20 |
Subject Area | Physics |
MOST Discipline Catalogue | Physics, Multidisciplinary |
DOI | 10.1103/PhysRevLett.122.201101 |
Indexed By | SCIE |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.itp.ac.cn/handle/311006/23428 |
Collection | SCI期刊论文 |
Affiliation | 1.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 3.Kavli Inst Phys & Math Universe WPI, Chiba 2778583, Japan 4.Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan 5.Natl Taiwan Univ, Leung Ctr Cosmol & Particle Astrophys, Taipei 10617, Taiwan |
Recommended Citation 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). |
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