Oort cloud scattering by primordial black holes excludes them as all of the dark matter for masses between 100 and 100,000 solar masses and limits them to at most 0.2 percent at 1,000 solar masses.
Niikuraet al., Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events, Nat
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The Oort Cloud as a Gravitational Detector for Primordial Black Holes
Oort cloud scattering by primordial black holes excludes them as all of the dark matter for masses between 100 and 100,000 solar masses and limits them to at most 0.2 percent at 1,000 solar masses.