Nonlinear Schrodinger problems: symmetries of some variational solutions

In this paper, we are interested in the nonlinear Schrodinger problem -Delta u + Vu = |u| (p-2) u submitted to the Dirichlet boundary conditions. We consider p > 2 and we are working with an open bounded domain (N a parts per thousand yen 2). Potential V satisfies and . Moreover, -Delta + V is positive definite and has one and only one principal eigenvalue. When , we prove the uniqueness of the solution once we fix the projection on an eigenspace of -Delta + V. It implies partial symmetries (or symmetry breaking) for ground state and least energy nodal solutions. In the literature, the case V a parts per thousand 0 has already been studied. Here, we generalize the technique at our case by pointing out and explaining differences. To finish, as illustration, we implement the (modified) mountain pass algorithm to work with V negative, piecewise constant or not bounded. It permits us to exhibit direct examples where the solutions break down the symmetries of V.