Sign changing solution for a double phase problem with nonlinear boundary condition via the Nehari manifold

In this paper we study quasilinear elliptic equations driven by the so-called double phase operator and with a nonlinear boundary condition. Due to lack of regularity, prove existence multiple solutions applying Nehari manifold method along truncation comparison techniques critical point theory. addition, can also determine sign (one positive, one negative, nodal). Moreover, as result independent interest, for general class such problems boundedness weak solutions.