Non-uniqueness of normalized NLS ground states on polygons with homogeneous Neumann boundary conditions

We provide a non-uniqueness result for normalized ground states of nonlinear Schrödinger equations with pure power nonlinearity on polygons with homogeneous Neumann boundary conditions, defined as global minimizers of the associated energy functional among functions with prescribed mass. Precisely, for nonlinearity powers slightly smaller than the L2-critical exponent, we prove that there always exists at least one value of the mass for which normalized ground states are not unique.