On theory of transport phenomena in many-component quantum systems

The method of study the transport phenomena in many-component systems with a conserving momentum is developed. The general expressions are obtained for viscosity, thermoconductivity and diffusion coefficients of quasiparticles. The oscillations are also considered in such systems. The damped waves are shown to be of the hydrodynamic nature. The method devised was used to obtain the temperature dependence of attenuation of the second sound in a magnon gas.