If our galactic halo is composed of heavy (several gigaelectron- volts), weakly interacting particles, pair annihilation into a heavy-quark--antiquark bound state plus a monochromatic photon can produce potentially observable sharp peaks in the diffuse cosmic-{γ}-ray background.
No takes yet. Share an insight, caveat, or question.
Srednicki et al. (1986) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: