Ground states for a linearly coupled system of Schr\"odinger equations on $\mathbb{R}^{N}$

Abstract

We study the following class of linearly coupled Schr\"{o}dinger elliptic systems $$\left\{ \begin{array}{lr} -\Delta u+V_{1}(x)u=\mu|u|^{p-2}u+\lambda(x)v, & \quad x\in\mathbb{R}^{N}, \\ -\Delta v+V_{2}(x)v=|v|^{q-2}v+\lambda(x)u, & x\in\mathbb{R}^{N}, \end{array} \right. $$ where $N\geq3$, $2 0$ such that the coupled system possesses positive ground state solution for all $\mu\geq\mu_{0}$. In these cases, we use a minimization method based on Nehari manifold. Finally, we consider the case $p=q=2^{*}$, and we prove that the coupled system has no positive solutions. For that matter, we use a Pohozaev identity type.