Reionization effect enhancement due to primordial black holes
  Primordial black holes (PBH) could account for variety of phenomena like dark
matter, reionization of the Universe, early quasars, coalescence of black holes
registered through gravitational waves recently. Each phenomenon relates to PBH
of a specific mass range. PBH mass spectra varies in a wide range depending on
specific model. Earlier we have shown that PBH with monochromatic mass
distribution around $5\times 10^{16}$ g value allow to re-ionize the Universe
moderately. Here we show that reionization effect and contribution to dark
matter can be simultaneously enhanced with more natural extended mass
distribution in the range around the same mass value.
