On relativistic kinetic theory of transport processes, in particular of neutrino systems

From a transport equation, incorporating both relativistic and quantum aspects, transport coefficients have been obtained for various particle interactions. For neutrino systems, dominated by the weak interaction, viscosities, heat conductivities and diffusion coefficients have been calculated as functions of the state parameters. Moreover, a mechanism for the separation of neutrinos and antineutrinos through thermal diffusion is indicated. These results constitute data of cosmological importance, since they apply to the primordial gas of the lepton era, which lasted from 10-4 to 10 seconds after the hot big bang