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In this talk I summarize the one loop and higher loop calculations of theeffective equations of motion of the O(N) symmetric scalar model in the linearresponse approximation. At one loop one finds essential difference in long timebehavior for the fields below and above a dynamically generated length scale. Apartial resummation assuming quasi-particle propagation seems to cancel therelevance of this scale.Comment: Talk given at SEWM2000. 5 page

DYNAMICAL RESUMMATION AND DAMPING IN THE O(N) MODEL