Stimulated axion decay around superradiant primordial black holes yields photon fluxes that exceed observed backgrounds, forcing f_PBH < 10^-17 for PBH masses 10^-19 to 10^-7 solar masses.
Thus, galaxies are overdensities of dark matter with a Navarro-Frenk- White (NFW) density profile
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Bounds on PBH fraction in a stimulated axion/ALP decay scenario
Stimulated axion decay around superradiant primordial black holes yields photon fluxes that exceed observed backgrounds, forcing f_PBH < 10^-17 for PBH masses 10^-19 to 10^-7 solar masses.