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

Abstract

We prove local well-posedness of partially periodic and periodic modified KP-I equations, namely for ${\partial }_{t}u+(-1{)}^{\frac{l+1}{2}}{\partial }_x^{l}u-{\partial }_x^{-1}{\partial }_y^{2}u+u^2{\partial }_{x}u=0$ 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.

41 pages