Parametric superlinear double phase problems with singular term and critical growth on the boundary

Abstract

In this paper we study quasilinear elliptic equations driven by the double phase operator along with a reaction that has a singular and a parametric superlinear term and with a nonlinear Neumann boundary condition of critical growth. Based on a new equivalent norm for Musielak-Orlicz Sobolev spaces and the Nehari manifold along with the fibering method we prove the existence of at least two weak solutions provided the parameter is sufficiently small.

On a class of critical double phase problems

“…In order to provide a multiplicity result for (1.6), in the current paper we need to work globally in the whole space W 1,H 0 (Ω). Very recently, Crespo-Blanco-Papageorgiou-Winkert [15] have been considered a nonhomogeneous singular Neumann double phase problem with critical growth on the boundary given by…”