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arXiv 0911.5686math-phmath.MP
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小色散极限下Korteweg-de Vries方程的孤子渐近性

Solitonic asymptotics for the Korteweg-de Vries equation in the small dispersion limit

T. Claeys, T. Grava

摘要:

研究了Korteweg-de Vries(KdV)方程$u_t+6uu_x+ε^{2}u_{xxx}=0$在临界尺度下的小色散极限,其中$x$接近KdV解显示振荡行为的区域的后缘.利用Riemann-Hilbert方法,我们得到了KdV解在双标度极限下的渐近展开式,表明振荡在尾缘附近退化为尖脉冲.这些脉冲局部类似于KdV方程的孤子解。

英文摘要:

We study the small dispersion limit for the Korteweg-de Vries (KdV) equation $u_t+6uu_x+ε^{2}u_{xxx}=0$ in a critical scaling regime where $x$ approaches the trailing edge of the region where the KdV solution shows oscillatory behavior. Using the Riemann-Hilbert approach, we obtain an asymptotic expansion for the KdV solution in a double scaling limit, which shows that the oscillations degenerate to sharp pulses near the trailing edge. Locally those pulses resemble soliton solutions of the KdV equation.

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