Schrodinger-Kirchhoff-Poisson type systems

Abstract

In this article we study the existence of solutions to the system \begin{equation*}\left\{ \begin{array}{ll} -\left(a+b\int_Ω|\nabla u|^{2}\right)Δu +ϕu= f(x, u) &\text{in }Ω\hbox{} -Δϕ= u^{2} &\text{in }Ω\hbox{} u=ϕ=0&\text{on }\partialΩ, \hbox{} \end{array} \right. \end{equation*} where $Ω$ is a bounded smooth domain of $\mathbb{R}^N$ ($N=1,2$ or $3$), $a>0$, $b\geq0$, and $f:\overlineΩ\times \mathbb{R}\to\mathbb{R}$ 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.