Dark matter around primordial black hole at the radiation-dominated stage

Abstract

The accumulation of dark matter particles near the primordial black holes starts at the radiation-dominated cosmological stage and produces the central density spikes. The spikes can be the bright gamma-ray sources due to dark matter annihilation. We present the self-consistent derivation of the equation of motion of particle in the metrics of primordial black hole immersed into cosmological background. By numerical solution of this equation we find the central dark matter density profile. The density growth is suppressed in the central part of the profile compared with previous calculations.

3 pages, 1 figure; Presented at the 10th Alexander Friedmann International Seminar on Gravitation and Cosmology, Saint Petersburg, Russia

References in corpus (2)

• Dark Matter Density Spikes around Primordial Black Holes
• Primordial Black Hole as a Source of the Boost Factor

Cited by in corpus (8)

• Constraints on Stupendously Large Black Holes
• Primordial Black Holes
• Black Holes and WIMPs: All or Nothing or Something Else
• In-depth analysis of the clustering of dark matter particles around primordial black holes I: density profiles
• Sharpening the dark matter signature in gravitational waveforms I: Accretion and eccentricity evolution
• Primordial black hole dark matter in the presence of p-wave WIMP annihilation
• CMB and 21cm bounds on early structure formation boosted by primordial black hole entropy fluctuations
• Evolution of the DM distribution function in the density spikes around PBHs