Anti-Deuterons and Anti-Helium Nuclei from Annihilating Dark Matter

Understand

Recent studies of the cosmic-ray antiproton-to-proton ratio have identified an excess of $\sim$10-20 GeV antiprotons relative to the predictions of standard astrophysical models.

• Intriguingly, the properties of this excess are consistent with the same range of dark matter models that can account for the long-standing excess of $\gamma$-rays observed from the Galactic Center.
• Such dark matter candidates can also produce significant fluxes of anti-deuterium and anti-helium nuclei.
• Here we study the production and transport of such particles, both from astrophysical processes as well as from dark matter annihilation.