Concentration-compactness results for systems in the Heisenberg group

Abstract

In this paper we complete the study started in [P. Pucci, L. Temperini, <i>Existence for (p,q) critical systems in the Heisenberg group</i>, Adv. Nonlinear Anal. 9 (2020), 895–922] on some variants of the concentration-compactness principle in bounded PS domains $\Omega$ of the Heisenberg group $\mathbb{H}^n$. The concentration-compactness principle is a basic tool for treating nonlinear problems with lack of compactness. The results proved here can be exploited when dealing with some kind of elliptic systems involving critical nonlinearities and Hardy terms.