Ground state of a magnetic nonlinear Choquard equation

TL;DR

This paper establishes the existence and multiplicity of ground state solutions for a magnetic nonlinear Choquard equation involving a vector potential, scalar potential, and nonlocal nonlinearities, under mild assumptions.

Contribution

It provides the first existence and multiplicity results for ground states of a magnetic nonlinear Choquard equation with nonlocal nonlinearities.

Findings

Existence of a ground state solution under mild hypotheses.

Multiplicity of solutions via Ljusternik-Schnirelmann methods.

Application of variational techniques to a nonlocal magnetic PDE.

Abstract

We consider the stationary magnetic nonlinear Choquard equation \[-(\nabla+iA(x))^2u+ V(x)u=\bigg(\frac{1}{|x|^{\alpha}}*F(|u|)\bigg)\frac{f(|u|)}{|u|}{u},\] where $A: \mathbb{R}^{N}\rightarrow \mathbb{R}^{N}$ is a vector potential, $V$ is a scalar potential, $f\colon\mathbb{R}\to\mathbb{R}$ and $F$ is the primitive of $f$. Under mild hypotheses, we prove the existence of a ground state solution for this problem. We also prove a simple multiplicity result by applying Ljusternik-Schnirelmann methods.