Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field,Physical Review D

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Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
Physical Review D ( IF 4.6 ) Pub Date : 2021-10-20 , DOI: 10.1103/physrevd.104.083537
Rong-Gen Cai _{1,

2} , Chao Chen _{3,

4} , Chengjie Fu ₁

Affiliation

We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling term with a periodic function of inflaton triggers the exponential growth of the spectator field perturbations, which indirectly amplifies the curvature perturbations to produce a sizable abundance of primordial black holes (PBHs). This scenario is found to be insensitive to the inflationary background. We study two distinct populations of the stochastic gravitational wave background (SGWB) produced in this scenario, i.e., induced by the scalar perturbations during the inflationary era and the radiation-dominated era, respectively. With the appropriate choices of parameter space, we consider two PBH mass windows of great interest. One is PBHs of masses

O (10^{- 12}) M_{⊙}

that can be a vital component of dark matter, and the predicted total energy spectrum of SGWB shows a unique profile and is detectable by LISA and Taiji. The other is PBHs of masses

O (10) M_{⊙}

which can provide consistent explanation for the LIGO-Virgo events. More interestingly, the predicted gravitational wave signal from the radiation-dominated era may account for the NANOGrav 12.5-yr results.

中文翻译：

原始黑洞和随机引力波背景来自非规范观察场暴涨

我们研究了单场慢滚膨胀中曲率扰动的增强，观察者标量场与暴胀子动力学耦合。与暴胀子周期函数的耦合项触发了观众场扰动的指数增长，这间接放大了曲率扰动以产生大量原始黑洞 (PBH)。发现这种情况对通货膨胀背景不敏感。我们研究了在这种情况下产生的随机引力波背景 (SGWB) 的两个不同群体，即分别由暴胀时代和辐射主导时代的标量扰动引起的。通过适当的参数空间选择，我们考虑了两个兴趣的PBH质量窗口。一种是大众的 PBH