On the embedding of weighted Sobolev spaces with applications to a planar nonlinear Schrödinger equation

In this paper we study the embedding properties for the weighted Sobolev space $H_V^1({\mathbb{R}}^N)$ into the Lebesgue weighted space $L_W^{\tau }({\mathbb{R}}^N)$. Here $V$ and $W$ are diverging weight functions. The different behaviour of $V$ with respect to $W$ at infinity plays a crucial role. Particular attention is paid to the case $V=W$. This situation is very delicate since it depends strongly on the dimension and, in particular, $N=2$ is somewhat a limit case. As an application, an existence result for a planar nonlinear Schrödinger equation in presence of coercive potentials is provided.