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arXiv · 2405.07125

On uniqueness of KP soliton structures

Francisco Alegría·Gong Chen·Claudio Muñoz·Felipe Poblete·Benjamín Tardy
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Abstract

We consider the Kadomtsev-Petviashvili II (KP) model placed in $\mathbb R_t \times \mathbb R_{x,y}^2$, in the case of smooth data that are not necessarily in a Sobolev space. In this paper, the subclass of smooth solutions we study is of ``soliton type'', characterized by a phase $Θ=Θ(t,x,y)$ and a unidimensional profile $F$. In particular, every classical KP soliton and multi-soliton falls into this category with suitable $Θ$ and $F$. We establish concrete characterizations of KP solitons by means of a natural set of nonlinear differential equations and inclusions of functionals of Wronskian, Airy and Heat types, among others. These functional equations only depend on the new variables $Θ$ and $F$. A distinct characteristic of this set of functionals is its special and rigid structure tailored to the considered soliton. By analyzing $Θ$ and $F$, we establish the uniqueness of line-solitons, multi-solitons, and other degenerate solutions among a large class of KP solutions. Our results are also valid for other 2D dispersive models such as the quadratic and cubic Zakharov-Kuznetsov equations.

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Francisco Alegría, Gong Chen, Claudio Muñoz, Felipe Poblete, Benjamín Tardy. 2025-07-21. On uniqueness of KP soliton structures. https://arxiv.org/abs/2405.07125

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