Schrodinger-Kirchhoff-Poisson type systems

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 $\mathrm{\Omega }$ is a bounded smooth domain of ${\mathbb{R}}^N$ ($N=1,2$ or $3$), $a>0$, $b\ge 0$, and $f:\bar{\mathrm{\Omega }}\times \mathbb{R}\to \mathbb{R}$ 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.