Dark Matter Mini-halo around the Compact Objects: the Formation, Evolution and Possible Contribution to the Cosmic Ray Electrons/Positrons

TL;DR

This paper explores how dark matter mini-halos around compact objects form and evolve, and assesses their potential contribution to cosmic ray electrons and positrons, highlighting the rarity of detectable signals.

Contribution

It introduces the concept of dense dark matter mini-halos around neutron stars and evaluates their possible role in cosmic ray production.

Findings

Mini-halos may be common in the Galaxy.

Detectable signals require mini-halos within ~0.1 pc of Earth.

Dark matter annihilation in mini-halos could contribute to cosmic rays.

Abstract

Dark matter particles may be captured by a star and then thermalized in the star's core. At the end of its life a massive star collapses suddenly and a compact object is formed. The dark matter particles redistribute accordingly. In the inelastic dark matter model, an extended dense dark matter mini-halo surrounding the neutron star may be formed. Such mini-halos may be common in the Galaxy. The electron/positron flux resulting in the annihilation of dark matter particles, however, is unable to give rise to observable signal unless a nascent mini-halo is within a distance \sim a few 0.1 pc from the Earth.