With a quartic scalar self-coupling, dark-sector Fermi balls saturate early and become compact enough to collapse into primordial black holes.
Explaining the GeV excess with exploding black holes
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Black holes may form in present-day collapse of microscopic structures of dark matter. We show that, if microstructure black holes (MSBH) with mass $m\sim 10^{13}~g$ are produced, the spectrum of gamma rays from their evaporation agrees remarkably well with the GeV excess observed by Fermi Gamma-ray Space Telescope, while still avoiding all observational constraints. We also discuss the generic requirements for MSBHs to explain the GeV excess.
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Black Holes from Fermi Ball Collapse
With a quartic scalar self-coupling, dark-sector Fermi balls saturate early and become compact enough to collapse into primordial black holes.