Schrodinger-Kirchhoff-Poisson type systems

TL;DR

This paper proves the existence of multiple solutions, including positive, negative, and sign-changing ones, for a nonlinear Schrödinger-Kirchhoff-Poisson system using variational methods, with additional results for odd nonlinearities.

Contribution

It introduces new variational techniques to establish multiple solutions for a class of nonlinear Schrödinger-Kirchhoff-Poisson systems, including an unbounded sequence of sign-changing solutions.

Findings

Existence of three solutions: positive, negative, and sign-changing.

Development of variants of the mountain pass theorem for this system.

Presence of an unbounded sequence of sign-changing solutions when the nonlinearity is odd.

Abstract

In this article we study the existence of solutions to the system \begin{equation*}\left\{ \begin{array}{ll} -\left(a+b\int_{\Omega}|\nabla u|^{2}\right)\Delta u +\phi u= f(x, u) &\text{in }\Omega \hbox{} -\Delta \phi= u^{2} &\text{in }\Omega \hbox{} u=\phi=0&\text{on }\partial\Omega, \hbox{} \end{array} \right. \end{equation*} where $\Omega$ is a bounded smooth domain of $\mathbb{R}^N$ ($N=1,2$ or $3$), $a>0$, $b\geq0$, and $f:\overline{\Omega}\times \mathbb{R}\to\mathbb{R}$ is a continuous function which is $3$-superlinear. By using some variants of the mountain pass theorem established in this paper, we show the existence of three solutions: one positive, one negative, and one which changes its sign. Furthermore, in case $f$ is odd with respect to $u$ we obtain an unbounded sequence of sign-changing solutions.