Primordial black holes in peak theory with a non-Gaussian tail

被引：46

作者：

Kitajima, Naoya ^{[1
,2
]}

Tada, Yuichiro ^{[3
,4
]}

Yokoyama, Shuichiro ^{[5
,6
]}

Yoo, Chul-Moon ^{[4
]}

机构：

[1] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Aoba Ku, Aramaki Aza Aoba 6-3, Sendai, Miyagi 9808578, Japan

[2] Tohoku Univ, Dept Phys, Aoba Ku, Aramaki Aza Aoba 6-3, Sendai, Miyagi 9808578, Japan

[3] Nagoya Univ, Inst Adv Res, Chikusa Ku, Furocho, Nagoya, Aichi 4648601, Japan

[4] Nagoya Univ, Dept Phys, Chikusa Ku, Furocho, Nagoya, Aichi 4648602, Japan

[5] Nagoya Univ, Kobayashi Maskawa Inst, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[6] Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2021年 / 10期

关键词：

primordial black holes; GR black holes; GRAVITATIONAL COLLAPSE;

D O I：

10.1088/1475-7516/2021/10/053

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we update the peak theory for the estimation of the primordial black hole (PBH) abundance, particularly by implementing the critical behavior in the estimation of the PBH mass and employing the averaged compaction function for the PBH formation criterion to relax the profile dependence. We apply our peak theory to a specific non-Gaussian feature called the exponential tail, which is characteristic in ultra slow-roll models of inflation. With this type of non-Gaussianity, the probability of a large perturbation is not suppressed by the Gaussian factor but decays only exponentially, so the PBH abundance is expected to be much enhanced. Not only do we confirm this enhancement even compared to the case of the corresponding nonlinearity parameter f(NL) = 5/2, but also we find that the resultant PBH mass spectrum has a characteristic maximal mass which is not seen in the simple Press-Schechter approach.

引用

页数：27

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