Global well-posedness for the Cauchy problem of the Zakharov-Kuznetsov equation in 2D

By S. Kinoshita. Annales de l'Institut Henri Poincare. Analyse non linéar, 2019

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This paper is concerned with the Cauchy problem of the $2$D Zakharov-Kuznetsov equation. We prove bilinear estimates which imply local in time well-posedness in the Sobolev space $H^s({\mathbb{R}}^2)$ for $s > -1/4$, and these are optimal up to the endpoint. We utilize the nonlinear version of the classical Loomis-Whitney inequality and develop an almost orthogonal decomposition of the set of resonant frequencies. As a corollary, we obtain global well-posedness in $L^2({\mathbb{R}}^2)$.

Subfields: Applied Mathematics, Mathematical Physics, Statistical and Nonlinear Physics

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