CRITICAL-BEHAVIOR OF COMPLEX INTERFACES

Dynamics of complex interfaces is investigated in a model of an oscill atory medium. The moving interfacial zone separating two phases of hom ogeneous oscillation consists of a phase with chaotic spatial and temp oral behavior. As system parameters vary, the thickness of the interfa ce grows until a phase transition occurs where the chaotic phase fills the entire domain. The system behavior and its critical properties ar e analyzed in terms of two coupled stochastic equations describing the profiles that delimit the interfacial zone.