Existence and multiplicity for perturbations of an equation involving a Hardy inequality and the critical Sobolev exponent in the whole of $\Bbb R^N$

Abstract

In order to obtain solutions to the problem $$ \left\{ \begin{array}{c} -\Delta u=\dfrac{A+h(x)} {|x|^2}u+k(x)u^{2^*-1},\,\,x\in {{{\mathbb R}}^N}, \\ u>0 \hbox{ in }{{{\mathbb R}}^N}, \mbox{ and }u\in {{\mathcal D}^{1,2}}({{{\mathbb R}}^N}), \end{array} \right. $$ $h$ and $k$ must be chosen taking into account not only the size of some norm but the shape. Moreover, if $h(x)\equiv 0$, to reach a multiplicity of solutions, some hypotheses about the local behavior of $k$ close to the points of maximum are needed.