Epoch of superheavy particle dominance in the Universe and primordial black holes

The stage of nonrelativistic superheavy particle dominance in the early Universe is predicted within the frame of grand unified theories of elementary particles. The minimal probability of primordial black hole (PBH) formation at this stage is estimated. The relation of the PBH mass spectrum with the initial spectrum of metrics perturbations and with parameters of the calibration theo. ries is discussed. The problem of restriction on mass of ordinary neutrino and the problem of relict magnetic dipoles are considered. The studied mechanism of PBH generation of small initial metrics perturbations permits to impose nontrivial restrictions on parameters of the uniform calibration theories