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

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.

preprint2019arXivOpen access
Yu. N. Eroshenko
astro-ph.CO
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Yu. N. Eroshenko

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