Search Publications

Primordial Black Holes as a Dark Matter Candidate Are Severely Constrained by the Galactic Center 511 keV γ -Ray Line

Laha, Ranjan

We derive the strongest constraint on the fraction of dark matter that can be composed of low mass primordial black holes by using the observation of the Galactic Center 511 keV γ -ray line. Primordial black holes of masses ≲10¹⁵ kg will evaporate to produce e^± pairs. The positrons will lose energy in the Galactic Center, bec…

Constraining Primordial Black Hole Abundance with the Galactic 511 keV Line

DeRocco, William; Graham, Peter W.

Models in which dark matter consists entirely of primordial black holes (PBHs) with masses around 1 0¹⁷ g are currently unconstrained. However, if PBHs are a component of the Galactic dark matter density, they will inject a large flux of energetic particles into the Galaxy as they radiate. Positrons produced by these black holes will su…