On mass spectra of primordial black holes
  Evidences for the primordial black holes (PBH) presence in the early Universe
renew permanently. New limits on their mass spectrum challenge existing models
of PBH formation. One of the known model is based on the closed walls collapse
after the inflationary epoch. Its intrinsic feature is multiple production of
small mass PBH which might contradict observations in the nearest future. We
show that the mechanism of walls collapse can be applied to produce
substantially different PBH mass spectra if one takes into account the
classical motion of scalar fields together with their quantum fluctuations at
the inflationary stage.
