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A consistent description of the kinetics and hydrodynamics of quantum Bose-systems. 1. The transport equation

Yi.O. Vakarchuk, Petro A. Hlushak, М. В. Токарчук

Published Jan 1, 1997• 0 citations
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A consistent approach to the description of kinetics and hydrodynamics of many-Boson systems is proposed.The generalized transport equations for strongly and weakly nonequilibrium Bose systems are obtained.Here we use the method of nonequilibrium statistical operator by D.N. Zubarev.New equations for the time distribution function of the quantum Bose system with a separate contribution from both the kinetic and potential energies of particle interactions are obtained.The generalized transport coefficients are determined accounting for the consistent description of kinetic and hydrodynamic processes.
An approach to the description of kinetics which taking into account the large-scale hydrodynamic transport processes for quantum Bose system is proposed. The nonequilibrium statistical operator which consistently describes both the kinetic and nonlinear hydrodynamic fluctuations in quantum liquid is calculated. Using this operator the coupled equations for quantum one-particle distribution function and functional of hydrodynamic variables: densities of momentum, energies and number of particles are obtained.
Using the method of nonequilibrium statistical operator by Zubarev, an approach is proposed for the description of kinetics which takes into account the nonlinear hydrodynamic fluctuations for a quantum Bose system.Non-equilibrium statistical operator is presented which consistently describes both the kinetic and nonlinear hydrodynamic processes.Both a kinetic equation for the nonequilibrium one-particle distribution function and a generalized Fokker-Planck equation for nonequilibrium distribution function of hydrodynamic variables (densities of momentum, energy and particle number) are obtained.A structure function of hydrodynamic fluctuations in cumulant representation is calculated, which makes it possible to analyse the generalized Fokker-Planck equation in Gaussian and higher approximations of the dynamic correlations of hydrodynamic variables which is important in describing the quantum turbulent processes.