Robust cosmic-ray constraints on $p$-wave annihilating MeV dark matter

Understand

We recently proposed a method to constrain $s$-wave annihilating MeV dark matter from a combination of the Voyager 1 and the AMS-02 data on cosmic-ray electrons and positrons.

• Voyager 1 actually provides an unprecedented probe of dark matter annihilation to cosmic rays down to $\sim 10$ MeV in an energy range where the signal is mostly immune to uncertainties in cosmic-ray propagation.
• In this article, we derive for the first time new constraints on $p$-wave annihilation down to the MeV mass range using cosmic-ray data.
• To proceed, we derive a self-consistent velocity distribution for the dark matter across the Milky Way by means of the Eddington inversion technique and its extension to anisotropic systems.