
Future Constraints on Primordial Black Holes from MeV Telescopes
Black Holes that are formed promptly in the early universe are one potential component of the universe's dark matter. Such black holes can Hawking radiate, producing radiation with a temperature that is inversely proportional to their mass. For black holes in the mass range of about 10^15 - 10^17 grams, this emission is concentrated in the MeV band, where previous instrumental constraints have been relatively weak. In this paper, we analyze the capability of next-generation MeV telescopes, such as e-ASTROGAM and AMEGO, to observe or constrain such a dark matter signal, utilizing for the first time well-motivated astrophysical background templates extrapolated from Fermi-LAT observations. We show that if primordial black holes are responsible for the previously detected excess of 511 keV gamma-rays, such telescopes could definitively determine the characteristics of the underlying primordial black hole population.
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