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arXiv 0909.1857math.APmath.CA
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广义Kadomtsev-Petviashvili方程周期行波解的横向不稳定性

Transverse Instability of Periodic Traveling Waves in the Generalized Kadomtsev-Petviashvili Equation

Mathew A. Johnson, Kevin Zumbrun

摘要:

本文研究了广义Kadomtsev-Petviashvili方程的周期行波解对长波长横向扰动的谱不稳定性.通过分析适当的周期性埃文斯函数的高,低频率限制,我们推导出一个取向指数,产生充分条件,这样的不稳定性发生。这个指数是几何性质的,适用于任意周期性行波与小光滑和凸性假设的非线性。利用控制行波剖面的常微分方程的可积结构,我们能够计算Korteweg-de Vries方程和修正Korteweg-de Vries方程的椭圆函数解的取向指数。

英文摘要:

In this paper, we investigate the spectral instability of periodic traveling wave solutions of the generalized Korteweg-de Vries equation to long wavelength transverse perturbations in the generalized Kadomtsev-Petviashvili equation. By analyzing high and low frequency limits of the appropriate periodic Evans function, we derive an orientation index which yields sufficient conditions for such an instability to occur. This index is geometric in nature and applies to arbitrary periodic traveling waves with minor smoothness and convexity assumptions on the nonlinearity. Using the integrable structure of the ordinary differential equation governing the traveling wave profiles, we are then able to calculate the resulting orientation index for the elliptic function solutions of the Korteweg-de Vries and modified Korteweg-de Vries equations.

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