Multiple solutions for a quasilinear Schrödinger–Poisson system

Abstract

Abstract In this article, we consider the following quasilinear Schrödinger–Poisson system 0.1 { − Δ u + V ( x ) u − u Δ ( u 2 ) + K ( x ) ϕ ( x ) u = g ( x , u ) , x ∈ R 3 , − Δ ϕ = K ( x ) u 2 , x ∈ R 3 , $$ \textstyle\begin{cases} -\Delta u+V(x)u-u\Delta (u^{2})+K(x)\phi (x)u=g(x,u), \quad x\in \mathbb{R}^{3}, \\ -\Delta \phi =K(x)u^{2}, \quad x\in \mathbb{R}^{3}, \end{cases} $$ where V , K : R 3 → R $V,K:\mathbb{R}^{3}\rightarrow \mathbb{R}$ and g : R 3 × R → R $g:\mathbb{R}^{3}\times \mathbb{R}\rightarrow \mathbb{R}$ are continuous functions; g is of subcritical growth and has some monotonicity properties. The purpose of this paper is to find the ground state solution of (0.1), i.e., a nontrivial solution with the least possible energy by taking advantage of the generalized Nehari manifold approach, which was proposed by Szulkin and Weth. Furthermore, infinitely many geometrically distinct solutions are gained while g is odd in u.

Keywords

• Generalized Nehari manifold
• Quasilinear system
• Schrödinger–Poisson
• Multiple solutions