The time evolution of non-equilibrium polariton condensate has been studied in the framework of microscopic approach. It has been shown that due to polariton-polariton scattering a significant condensate depletion takes place in a comparatively short time interval. The condensate decay occurs in the form of multiple echo signals. Distribution function dynamics of non-condensate polaritons has been investigated. It has been shown that there are stochastic ripples on the smooth curve of the distribution function.
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