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Models in which dark matter consists entirely of primordial black holes(PBHs) with masses around $10^{17}$ g are currently unconstrained. However, ifPBHs are a component of the Galactic dark matter density, they will inject alarge flux of energetic particles into the Galaxy as they radiate. Positronsproduced by these black holes will subsequently propagate throughout the Galaxyand annihilate, contributing to the Galactic 511 keV line. Using measurementsof this line by the INTEGRAL satellite as a constraint on PBH positroninjection, we place new limits on PBH abundance in the mass range $10^{16} -10^{17}$ g, ruling out models in which these PBHs constitute the entirety ofdark matter.

Constraining primordial black hole abundance with the Galactic 511 keV line