Evolution of the DM distribution function in the density spikes around PBHs

被引：1

作者：

Eroshenko, Yu. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Nucl Res, Pr 60 Letiya Oktyabrya 7a, Moscow 117312, Russia

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 08期

基金：

俄罗斯科学基金会;

关键词：

primordial black holes; dark matter theory; gravity; particle physics- cosmology connection; PRIMORDIAL BLACK-HOLES; DARK-MATTER;

D O I：

10.1088/1475-7516/2024/08/019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

At the cosmological stage of radiation dominance, dark matter density spikes should form around primordial black holes. In the case when dark matter particles are able to annihilate, the density in the central regions of the spikes decreases due to the elimination of particles, which gives an upper bound on the central density. In this paper, the modification of the central density profile is investigated, taking into account the distribution of the particle orbits. The orbits in spike around a primordial black hole are very elongated, almost radial, and the angular momentum distribution has an exponential form. For such an initial distribution function, it is obtained that a cusp with the exponent approximate to -0 . 7 is formed in the central region, instead of an annihilation plateau. The presence of the cusp provides some correction to the rate of dark matter annihilation around primordial black holes.

引用

页数：14

共 32 条

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