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We propose a simple discrete model to study the nonequilibrium fluctuations of two locally coupled (1+1)-dimensional systems (interfaces). Measuring numerically the tilt-dependent velocity we construct a set of stochastic continuum equations describing the fluctuations in the model. The scaling predicted by the equations is studied analytically using dynamic-renormalization-group theory and compared with simulation results.
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Albert-Ĺaszló Barabási (1992) studied this question.
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