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arXiv 1302.2933math.AP
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Zakharov-Kuznetsov方程的双线性Schwarz估计及其应用

Bilinear Strichartz estimates for the Zakharov-Kuznetsov equation and applications

Luc Molinet, Didier Pilod

摘要:

本文研究Zakharov-Kuznetsov方程{方程} \label{ZK0} \partial_t u+ \partial_x Δu+u \partial_x u=0 . {equation}我们证明了相关的初值问题在$H^s(\mathbb R^2)$中对于$s>\frac12$是局部适定的,在$H^1(\mathbb R\times \mathbb T)$和$H^s(\R^3) $中对于$ s>1$是全局适定的.我们的主要新成分是一个双线性的Burgain的空间,它允许控制出现在\eqref{ZK0}的非线性的高低频率的相互作用的上下文中的Eschhartz估计。在$\mathbb R^2$的情况下,我们还需要使用Carbery,Kenig和Ziesler关于齐次色散算子的锐Eschhartz估计的最近结果。最后,为了证明$ \R^3 $中的整体适定性结果,我们需要使用Koch和Tataru引入的原子空间。

英文摘要:

This article is concerned with the Zakharov-Kuznetsov equation {equation} \label{ZK0} \partial_tu+\partial_xΔu+u\partial_xu=0 . {equation} We prove that the associated initial value problem is locally well-posed in $H^s(\mathbb R^2)$ for $s>\frac12$ and globally well-posed in $H^1(\mathbb R\times \mathbb T)$ and in $H^s(\R^3) $ for $ s>1$. Our main new ingredient is a bilinear Strichartz estimate in the context of Bourgain's spaces which allows to control the high-low frequency interactions appearing in the nonlinearity of \eqref{ZK0}. In the $\mathbb R^2$ case, we also need to use a recent result by Carbery, Kenig and Ziesler on sharp Strichartz estimates for homogeneous dispersive operators. Finally, to prove the global well-posedness result in $ \R^3 $, we need to use the atomic spaces introduced by Koch and Tataru.

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