Positive ground states for a subcritical and critical coupled system involving Kirchhoff-Schr\"odinger equations

In this paper we prove the existence of positive ground state solution for a class of linearly coupled systems involving Kirchhoff-Schr"odinger equations. We study the subcritical and critical case. Our approach is variational and based on minimization technique over the Nehari manifold. We also obtain a nonexistence result using a Pohozaev identity type.