Gravitational Waves Induced by Non-Gaussian Scalar Perturbations
文献类型：期刊论文
| 作者 | Cai, RG ; Pi, S1; Sasaki, M1,4,5
|
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 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 |
| 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.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 3.Natl Taiwan Univ, Leung Ctr Cosmol & Particle Astrophys, Taipei 10617, Taiwan 4.Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan 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). |
入库方式： OAI收割
来源：理论物理研究所
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