Velocity dispersion data from Leo I rules out PBH dark matter fractions f_PBH ≳ 2.0 × (1 M_⊙ / m_PBH)^2 at 99.99% confidence for masses ~1-1000 M_⊙.
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Updated compilation shows PBHs are tightly constrained across 55 orders of magnitude in mass, ruling out dominant dark matter contributions except in narrow windows, with many limits carrying observational uncertainties.
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Constraining primordial black holes in dark matter with kinematics of dwarf galaxies
Velocity dispersion data from Leo I rules out PBH dark matter fractions f_PBH ≳ 2.0 × (1 M_⊙ / m_PBH)^2 at 99.99% confidence for masses ~1-1000 M_⊙.