The Cahn-Hilliard equation with "frozen-in" fluctuations of mobility

Early time kinetics of a system with conserved order parameter quenched int o an unstable two-phase region of the phase diagram is considered. We study the process of phase separation under the influence of random "frozen-in" inhomogeneities of mobility. The combined effect of this "frozen-in" random ness and persistent thermal fluctuations on the structure factor is discuss ed. The maximum instability of the Cahn-Hilliard type shifts to larger wave lengths, which may be interpreted as "coarsening" even for small times.