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arXiv math-ph/0411059math-phmath.APmath.MP
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变底上KdV孤立波的长时间动力学

Long-Time Dynamics of KdV Solitary Waves over a Variable Bottom

S. I. Dejak, I. M. Sigal

摘要:

研究了变水深广义Korteweg-de Vries(bKdV)方程dt u=-dx(dx ^2 u+f(u)-b(t,x)u),其中f是非线性项,b是与水深变化有关的小的、有界的缓变函数.许多变系数KdV型方程,包括变系数、变底KdV方程,都可以重新标度为bKdV。我们研究了初始条件接近稳定的,b=0孤立波的解决方案的长期行为。我们证明了在较长的时间间隔内,这样的解具有孤立波的形式,其中心和尺度根据涉及函数b(t,x)的一定动力学规律以及H^1-小涨落而演化。

英文摘要:

We study the variable bottom generalized Korteweg-de Vries (bKdV) equation dt u=-dx(dx^2 u+f(u)-b(t,x)u), where f is a nonlinearity and b is a small, bounded and slowly varying function related to the varying depth of a channel of water. Many variable coefficient KdV-type equations, including the variable coefficient, variable bottom KdV equation, can be rescaled into the bKdV. We study the long time behaviour of solutions with initial conditions close to a stable, b=0 solitary wave. We prove that for long time intervals, such solutions have the form of the solitary wave, whose centre and scale evolve according to a certain dynamical law involving the function b(t,x), plus an H^1-small fluctuation.

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