Ellipsoidal collapse and primordial black hole formation

被引：26

作者：

Kuhnel, Florian ^{[1
]}

Sandstad, Marit ^{[2
,3
]}

机构：

[1] Stockholm Univ, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, AlbaNova, SE-10691 Stockholm, Sweden

[2] KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

[3] Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 06期

基金：

瑞典研究理事会;

关键词：

LARGE-SCALE STRUCTURE; DARK-MATTER; GRAVITATIONAL COLLAPSE; TRIAXIAL COLLAPSE; COSMIC STRUCTURES; MASS FUNCTION; MODEL; EVOLUTION; GALAXIES; HALO;

D O I：

10.1103/PhysRevD.94.063514

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We reinvestigate gravitational ellipsoidal collapse with special focus on its impact on primordial black hole formation. We start with the results for the collapse threshold in the case of ellipsoidal collapse in the context of structure formation, and show heuristically that a similar functional form for the threshold should be expected in the case of primordial black hole formation. For a generic model we apply this to demonstrate that the abundance and energy density of the produced primordial black holes can be significantly decreased when the nonsphericity of the overdensities is taken into account. Further numerical study of this phenomenon may be crucial in order to produce reliable predictions for primordial black hole abundances from inflationary models.

引用

页数：7

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