Boltzmann and Vlasov kinetic equations in anisotropic cosmological models

The structure of the Boltzmann and Vlasov Kinetic equations is considered for spatially uniform cosmological models taking into account the Einstein equations. A successive approximation technique is proposed for solving Boltzmann's equation at the intensely anisotropic vacuum stage of expansion for the type I Bianci cosmological model. It is shown that during the hadron stage the collisional gas can be found in a highly nonequilibrium state. © 1986 Plenum Publishing Corporation