Null detection of extra lensed images in 3500 mock systems constrains PBH abundance to ≲0.04-0.125% and excludes FDM masses below 0.4-3.5×10^{-22} eV at 95% CL depending on angular resolution.
Hernquist, An Analytical Model for Spherical Galaxies and Bulges, The Astrophysical Journal356, 359 (1990)
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Probing Dark Matter Substructure with Image Number Anomaly in Strong Lensing Systems
Null detection of extra lensed images in 3500 mock systems constrains PBH abundance to ≲0.04-0.125% and excludes FDM masses below 0.4-3.5×10^{-22} eV at 95% CL depending on angular resolution.