Diagram Technique for Nonequilibrium Processes
نویسنده
چکیده
A graph technique analogous to the usual Feynman technique in field theory is developed for calculating Green's functions for particles in a statistical system which under the action of an external field deviates to any arbitrary extent from the state of thermodynamic equilibrium. It is found that in order to describe such a system it is necessary to introduce two Green's functions for each type of particles. The equation for one of these functions is a generalization of the usual Boltzmann kinetic equation.
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