Physical vacuum decay as a mechanism of the hot isotropic production Universe

In the framework of quasiclassical gravitation theory the problem of the Universe genesis from vacuum is discussed. The simplest model, in which geometric part of gravitation theory equations is einsteinian, and vacuum polarization effects are presented by conformal anomaly of energy-momentum tensor, is considered. The conclusion is made on the existence of three independent evolution branches of the expanding Universe: asymptotic transformation of plane space into the de Sitter-Hoyle space; exponential inflation of the de Sitter-Hoyle Universe and Friedman Universe, modified by quantum gravitational phenomena