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The method of the real time perturbative calculations of nonequilibriumaverages is generalised to the case of varying chemical potential. Calculationsare performed in the frame of Zubarev's nonequilibrium density matrix approach.In this approach perturbations of temperature and other thermodynamicalparameters are taken into account explicitly including nonlinear terms. Itdiffers from the Schwinger-Keldysh approach through the choice of more generalinitial conditions for the density matrix.Comment: 10 LaTeX pages, 1 LaTeX figure included in main pape

REAL TIME QUANTUM FIELD THEORY AT FINITE TEMPERATURE IN AN INHOMOGENEOUS MEDIA