Dark matter annihilation in the gravitational field of a black hole

Abstract

In this paper we consider dark matter particle annihilation in the gravitational field of black holes. We obtain exact distribution function of the infalling dark matter particles, and compute the resulting flux and spectra of gamma rays coming from the objects. It is shown that the dark matter density significantly increases near a black hole. Particle collision energy becomes very high affecting relative cross-sections of various annihilation channels. We also discuss possible experimental consequences of these effects.

9 pages, 1 figure

Cited by in corpus (13)

• Acceleration of particles by nonrotating charged black holes
• Emergent Flux from Particle Collisions Near a Kerr Black Hole
• Charged black hole in $4D$ Einstein-Gauss-Bonnet gravity: Particle motion, plasma effect on weak gravitational lensing and centre-of-mass energy
• Small-scale clumps of dark matter
• New gamma ray signal from gravitationally boosted neutralinos at the galactic center
• On collisions with unlimited energies in the vicinity of Kerr and Schwarzschild black hole horizons
• Charged Dilation Black Holes as Particle Accelerators
• High energy particle collisions in static, spherically symmetric black-hole-like wormholes
• Special case of the Bañados-Silk-West effect
• High energy collision without fine tuning: Acceleration and multiple collisions of shells in a bound system
• Neutral particle collisions near Gibbons-Maeda-Garfinkle-Horowitz-Strominger black holes after shadow observations
• Rotating Einstein-Maxwell-Dilaton Black Hole as a Particle Accelerator
• The impact of the eccentricity on the collapse of an ellipsoid into a black hole