Existence of bound and ground states for an elliptic system with double criticality

Abstract

We study the existence of bound and ground states for a class of nonlinear elliptic systems in RN. These equations involve critical power nonlinearities and Hardy-type singular potentials, coupled by a term containing up to critical powers. More precisely, we find ground states if either the positive coupling parameter ν is large or ν is small under suitable assumptions on the other parameters of the problem. Furthermore, bound states are found as Mountain-Pass-type critical points of the underlying functional constrained on the Nehari manifold. Our variational approach improves some known results and allows us to cover ranges of parameters which have not been considered previously.