Summary: Aim of this paper is to study the following elliptic equation driven by a general non-local integro-differential operator such that in in , where is an open bounded subset of , with Lipschitz boundary, is a positive real parameter, is a fractional critical Sobolev exponent, while is the non-local integrodifferential operator
As a concrete example, we consider the case when , which gives rise to the fractional Laplace operator . We show that our problem admits a nontrivial solution for any , provided and is different from the eigenvalues of . This result may be read as the non-local fractional counterpart of the one obtained by Capozzi, Fortunato and Palmieri and by Gazzola and Ruf for the classical Laplace equation with critical nonlinearities.
In this sense the present work may be seen as the extension of some classical results for the Laplacian to the case of non-local fractional operators.