Local wellposedness of the modified KP-I equations in periodic setting with small initial data

TL;DR

This paper establishes local well-posedness for the modified KP-I equations in periodic and partially periodic settings with small initial data, using anisotropic Sobolev spaces for specific derivatives orders and regularity levels.

Contribution

It provides the first well-posedness results for the modified KP-I equations in these settings with small initial data, covering different derivative orders and Sobolev space regularities.

Findings

Well-posedness in $H^{s,s}$ for $l=3$, $s>2$ in $ ext{R} imes ext{T}$

Well-posedness in $H^{s,s}$ for $l=3$, $s>19/8$ in $ ext{T} imes ext{T}$

Well-posedness in $H^{s,s}$ for $l=5$, $s>5/2$ in $ ext{R} imes ext{T}$

Abstract

We prove local well-posedness of partially periodic and periodic modified KP-I equations, namely for $\partial_t u+(-1)^{\frac{l+1}{2}}\partial^l_x u-\partial_x^{-1}\partial_y^2 u+u^2\partial_x u=0$ in the anisotropic Sobolev space $H^{s,s}(\mathbb{R}\times \mathbb{T})$ if $l=3$ and $s>2$, in $H^{s,s}(\mathbb{T}\times \mathbb{T})$ if $l=3$ and $s>\frac{19}{8}$, and in $H^{s,s}(\mathbb{R}\times \mathbb{T})$ if $l=5$ and $s>\frac{5}{2}$. All three results require the initial data to be small.