Improved constraints from ultra-faint dwarf galaxies on primordial black holes as dark matter

  title={Improved constraints from ultra-faint dwarf galaxies on primordial black holes as dark matter},
  author={Jakob Stegmann and Pedro R. Capelo and Elisa Bortolas and Lucio Mayer},
  journal={Monthly Notices of the Royal Astronomical Society},
Soon after the recent first ever detection of gravitational waves from merging black holes it has been suggested that their origin is primordial. Appealingly, a sufficient number of primordial black holes (PBHs) could also partially or entirely constitute the dark matter (DM) in our Universe. However, recent studies on PBHs in ultra-faint dwarf galaxies (UFDGs) suggest that they would dynamically heat up the stellar component due to two-body relaxation processes. From the comparison with the… 

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