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arXiv 1702.08708math.APnlin.PS
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全色散Camassa-Holm方程的调制不稳定性

Modulational instability in the full-dispersion Camassa-Holm equation

Vera Mikyoung Hur, Ashish K. Pandey

摘要:

我们确定的稳定性和不稳定性的一个足够小的周期性行波长波长的扰动,一个非线性色散方程,其中扩展了Camassa-Holm方程,包括所有的色散水波和Whitham方程,包括非线性介质振幅波。在没有表面张力的影响下,结果定性地与Stokes波的Benjamin-Feir不稳定性一致。在表面张力的影响下,它与物理问题的形式渐近展开定性地一致,并改进了Whitham方程,正确地预测了强表面张力的极限。讨论了Camassa-Holm方程及相关模型的调制稳定性和不稳定性。

英文摘要:

We determine the stability and instability of a sufficiently small and periodic traveling wave to long wavelength perturbations, for a nonlinear dispersive equation which extends a Camassa-Holm equation to include all the dispersion of water waves and the Whitham equation to include nonlinearities of medium amplitude waves. In the absence of the effects of surface tension, the result qualitatively agrees with the Benjamin-Feir instability of a Stokes wave. In the presence of the effects of surface tension, it qualitatively agrees with those from formal asymptotic expansions of the physical problem and it improves upon that for the Whitham equation, correctly predicting the limit of strong surface tension. We discuss the modulational stability and instability in the Camassa-Holm equation and related models.

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