Abstract
A modified Kardar-Parisi-Zhang (KPZ) equation is introduced, and solved exactly in the infinite-range limit. In the low-noise limit the system exhibits a weak-to-strong coupling transition, rounded for nonzero noise, as a function of the KPZ nonlinearity. The strong-coupling regime is characterized by a double-peaked height distribution in the stationary state. The nonstationary dynamics is quite different from that of the stationary state.
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