Ivankov O. Nonequilibrium density functions of confined systems

The thesis is devoted to the investigation of the evolution structure of the nonequilibrium system what is formed in relativistic heavy ion collisions. In the second chapter a model of mechanism of nucleons momentum spectra formation is proposed and nonequilibrium distribution functions of nucleons in momentum space are achieved. Theoretical results shows that to describe the shape of the nucleons distribution in momentum space the thermalized nucleons source must be considered. In the third chapter new definition of the fireball is proposed. Fireball is redefined as a region of space-time where all hadronic reactions occurred. Within the proposed concept of the zone of reactions structure of the fireball evolution in space-time is investigated. It is shown that the fireball evolution can be distinguished into several characteristic time intervals. The analytical expressions for the boundaries of the fireball expansion in space-time achieved.