Mildly boosted dark matter annihilation and reconciling indirect galactic signals

TL;DR

This paper proposes a two-component dark matter model with mildly boosted particles that remain bound to their galaxy, helping to reconcile conflicting gamma-ray signals from the galactic center and dwarf galaxies.

Contribution

It introduces a novel two-component dark matter framework that explains galactic gamma-ray signals without conflicting with dwarf galaxy observations.

Findings

Two-component dark matter can produce signals consistent with observations.

Mildly boosted particles remain bound, affecting signal dependence on galactic scale.

Reconciles galactic center excess with dwarf galaxy gamma-ray constraints.

Abstract

The galactic center excess is a possible non-gravitational observation of dark matter; however, the canonical dark matter model (thermal freeze-out) is in conflict with other gamma-ray observations, in particular those made of the Milky Way's satellite dwarf galaxies. Here we consider the effects of a two-component dark matter model which results in minimally boosted particles that must remain bound to their host galaxy in order to produce an observational signal. This leads to a signal that is heavily dependent on galactic scale and can help reconcile the differences in the galactic center and dwarf galaxy measurements under the dark matter paradigm.