Pulsar timing array constraints on the induced gravitational waves

被引：94

作者：

Cai, Rong-Gen ^{[1
,4
]}

Pi, Shi ^{[2
]}

Wang, Shao-Jiang ^{[3
]}

Yang, Xing-Yu ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China

[2] Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan

[3] Tufts Univ, Tufts Inst Cosmol, Dept Phys & Astron, 574 Boston Ave, Medford, MA 02155 USA

[4] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2019年 / 10期

基金：

中国国家自然科学基金;

关键词：

gravitational waves / experiments; gravitational waves / theory; primordial black holes; primordial gravitational waves (theory); PRIMORDIAL BLACK-HOLES; DENSITY; INFLATION;

D O I：

10.1088/1475-7516/2019/10/059

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

If the black holes detected by LIGO/VIRGO are primordial black holes (PBHs) sourcing from a large primordial curvature perturbation on small scales, the corresponding induced gravitational waves (GWs) would peak at nanohertz that is detectable by the current and future observations of pulsar timing array (PTA). In this paper we show that with the mass function estimated from the merger rate of LIGO O1 and O2 events, the induced GWs from such a curvature perturbation with a Gaussian narrow peak at some small scale would be in a seemingly mild tension with current constraints from PTA. However, if the curvature perturbation is of local-type non-Gaussianity with a non-linear parameter f(NL) greater than or similar to O(10), the tension could be relieved. Nevertheless, such an induced GWs must be detectable by the Square Kilometer Array in a decade or less.

引用

页数：24

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