Baryon generation and unusual symmetry behaviour at high temperatures

The high temperature symmetry behaviour in grand unified theories with gauge hierarchies is investigated. It is shown that in a certain range of coupling constants the electroweak symmetry is broken superstrongly at temperatures T approx. equal to 1015GeV. The cosmological consequences of this phenomenon are discussed. Fermion massiveness arising from SU(2)sub(L) breaking at very early stages of Universe expansion results in the production of an acceptable baryon excess in the framework of the minimal SU(5) model with three fermion generations. (orig.)