Primordial Black holes and Modification of Zeldovich-Novikov Mechanism
  Bulk of various astronomical observations of black holes suggest that
virtually all observed black holes can be of primordial origin. A modified
mechanism of the primordial black hole formation is described. A universal
log-normal mass spectrum with a mean mass of around $\sim 10 M_\odot$ predicted
by this mechanism is strongly confirmed by the LIGO/Virgo observations of
gravitational waves from coalescing binary black holes.
