Observation of a Kink Soliton on the Surface of a Liquid
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When a long channel of shallow liquid is driven parametrically, there can occur a 180' kink in the phase of the fundamental cross mode of the surface. The kink is stable and localized, and is nonpropagating in the limit where the system is uniform. The weakly nonlinear theoretical description is a damped driven nonlinear Schrodinger equation supplemented with second harmonics. The kink is a robust state even at amplitudes where the perturbation expansion leading to this equation is unjustified.
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