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arXiv 2007.01613math.AP
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Dysthe方程在$L^2(\mathbb R^2)$中的整体适定性和散射性

Global well-posedness and scattering for the Dysthe equation in $L^2(\mathbb R^2)$

Razvan Mosincat, Didier Pilod, Jean-Claude Saut

摘要:

本文重点讨论了Dysthe方程,它是调制(薛定谔)制度和无限深度情况下的水波系统的高阶近似。我们首先回顾Dysthe和相关方程的推导过程。然后我们研究了初值问题。在临界空间$L^2(\mathbb R^2)$中证明了小数据下的全局适定性和离散结果。考虑到流图在$L^2(\mathbb R^2)$以下不能是$C^3$连续的事实,该结果是尖锐的。我们的分析依赖于在傅立叶限制范数方法的背景下的线性和双线性Eschhartz估计。此外,由于我们处于临界水平,我们需要在原子空间$U^2_S$及其平方有界变差函数的对偶$V^2_S $的框架中工作。我们还证明了初值问题在$H^s(\mathbb R^2)$,$s>0$中是局部适定的.我们的结果扩展到有限深度版本的Dysthe方程。

英文摘要:

This paper focuses on the Dysthe equation which is a higher order approximation of the water waves system in the modulation (Schrödinger) regime and in the infinite depth case. We first review the derivation of the Dysthe and related equations. Then we study the initial-value problem. We prove a small data global well-posedness and scattering result in the critical space $L^2(\mathbb R^2)$. This result is sharp in view of the fact that the flow map cannot be $C^3$ continuous below $L^2(\mathbb R^2)$. Our analysis relies on linear and bilinear Strichartz estimates in the context of the Fourier restriction norm method. Moreover, since we are at a critical level, we need to work in the framework of the atomic space $U^2_S$ and its dual $V^2_S $ of square bounded variation functions. We also prove that the initial-value problem is locally well-posed in $H^s(\mathbb R^2)$, $s>0$. Our results extend to the finite depth version of the Dysthe equation.

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