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.
Moore, Long-period comets, inEncyclopedia of Ge- ology, edited by D
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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.