Cosmological inflation models admitting natural emergence to the radiation-dominated stage and the matter domination era

A model of the evolution of the uniform and isotropic spatially-flat univer se, where the inflation stage emerges naturally into the radiation-dominate d stage and the matter-dominated era, is proposed on the basis of exact sol utions of the self-consistent equations of a gravitating self-acting scalar field. It is shown that the model contains two basic physical mechanisms, one of which is related with the decay of Higgs bosons and provides for the inflation stage, while the second mechanism is associated with the adiabat ic expansion of the universe filled with matter with a definite equation of state and gives a Friedmann expansion regime. (C) 2000 MAIK "Nauka/Interpe riodica".