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Cai, RG; Pi, S2; Sasaki, M2,3,4
Gravitational Waves Induced by Non-Gaussian Scalar Perturbations
AbstractWe 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).
Subject AreaPhysics
MOST Discipline CataloguePhysics, Multidisciplinary
Indexed BySCIE
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Cited Times:58[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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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