Structure formation with primordial black holes: collisional dynamics, binaries, and gravitational waves

被引：6

作者：

Delos, M. Sten ^{[1
,2
]}

Rantala, Antti ^{[2
]}

Young, Sam ^{[3
,4
]}

Schmidt, Fabian ^{[2
]}

机构：

[1] Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA

[2] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[3] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, England

[4] Leiden Univ, Inst Lorentz Theoret Phys, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 12期

关键词：

dark matter simulations; primordial black holes; gravitational waves / sources; cosmological simulations; DARK-MATTER; ALGORITHMIC REGULARIZATION; SYMPLECTIC INTEGRATORS; HIERARCHICAL; 4TH-ORDER; STAR-CLUSTERS; EVOLUTION; PERTURBATIONS;

D O I：

10.1088/1475-7516/2024/12/005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Primordial black holes (PBHs) could compose the dark matter content of the Universe. We present the first simulations of cosmological structure formation with PBH dark matter that consistently include collisional few-body effects, post-Newtonian orbit corrections, orbital decay due to gravitational wave emission, and black-hole mergers. We carefully construct initial conditions by considering the evolution during radiation domination as well as early-forming binary systems. We identify numerous dynamical effects due to the collisional nature of PBH dark matter, including evolution of the internal structures of PBH halos and the formation of a hot component of PBHs. We also study the properties of the emergent population of PBH binary systems, distinguishing those that form at primordial times from those that form during the nonlinear structure formation process. These results will be crucial to sharpen constraints on the PBH scenario derived from observational constraints on the gravitational wave background. Even under conservative assumptions, the gravitational radiation emitted over the course of the simulation appears to exceed current limits from ground-based experiments, but this depends on the evolution of the gravitational wave spectrum and PBH merger rate toward lower redshifts.

引用

页数：49

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