Infinitely many non-radial solutions to a critical Choquard equation

Abstract

In this paper we study a class of critical Choquard equations with a symmetric potential, i.e. we consider the equation $$-Δu +V(|x|) u =\left(|x|^{-μ}* |u|^{2^\star_μ}\right)|u|^{2^\star_μ-2}u,\quad\mbox{in}\quad\mathbb R^N$$ where $V(|x|)$ is a bounded, nonnegative and symmetric potential in ${\mathbb{R}}^N$ with $N\ge 5$, $0<\mu \le 4$, $\ast$ stands for the standard convolution and $2_{\mu }^{\star }:=\frac{2N-\mu }{N-2}$ is the upper critical exponent in the sense of the Hardy - Littlewood - Sobolev inequality. By applying a finite dimensional reduction method we prove that if $r^{2}V(r)$ has a local maximum point or local minimum point $r_0>0$ with $V(r_0)>0$ then the problem has infinitely many non-radial solutions with arbitrary large energies.