Infinitely many small solutions for a sublinear Schrödinger–Poisson system with sign-changing potential

In this paper, we study the existence of infinitely many small solutions for a class of sublinear Schrödinger–Poisson system with sign-changing potential. By using a dual approach, we prove that the problem has infinitely many small solutions. As a main novelty with respect to some previous results, we do not require any growth condition on the nonlinear term.