Choquard equations with critical exponential nonlinearities in the zero mass case.

We investigate Choquard equations in RN driven by a weighted R^N-Laplace operator with polynomial kernel and zero mass. Since the setting is limiting for the Sobolev embedding, we work with nonlinearities which may grow up to the critical exponential. We establish the existence of a positive solution by variational methods, complementing the analysis in [32], where the case of a logarithmic kernel was considered. [ABSTRACT FROM AUTHOR]