Relativistic dark matter at the Galactic center

TL;DR

This paper investigates how velocity-dependent annihilation cross sections of neutralino dark matter influence the density profile and detection signals from the Galactic center, revealing significant modifications to expected signals.

Contribution

It demonstrates the impact of velocity-dependent annihilation cross sections on the dark matter density profile and indirect detection signals near the Galactic center.

Findings

Halo density profile flattens near the galactic center

Annihilation signal is significantly enhanced at high velocities

Velocity dependence alters indirect detection prospects

Abstract

In a large region of the supersymmetry parameter space, the annihilation cross section for neutralino dark matter is strongly dependent on the relative velocity of the incoming particles. We explore the consequences of this velocity dependence in the context of indirect detection of dark matter from the galactic center. We find that the increase in the annihilation cross section at high velocities leads to a flattening of the halo density profile near the galactic center and an enhancement of the annihilation signal.