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Constraints on late-forming exploding black holes
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Black holes can be produced in collapse of small-scale dark matter structures, which can happen at any time from the early to present-day universe. Microstructure black holes (MSBHs) can have a wide range of masses. Small MSBHs evaporate via Hawking radiation with lifetimes shorter than the age of the universe, but they are not subject to the usual early-universe bounds on the abundance of small primordial black holes. We investigate the possible signal of such a population of exploding, late-forming black holes, constraining their abundance with observations from diffuse extragalactic gamma- and x-ray sources, the galactic center, and dwarf spheroidal galaxies.
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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.
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