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Transport and generation of macroscopically modulated waves in diatomic chains
We derive and justify analytically the dynamics of a small macroscopically
modulated amplitude of a single plane wave in a nonlinear diatomic
chain with stabilizing on-site potentials including the case where a wave generates
another wave via self-interaction. More precisely, we show that in typical
chains acoustical waves can generate optical but not acoustical waves, while
optical waves are always closed with respect to self-interaction.