An alternative variational approach to constrained critical points for nonlinear Schr\"odinger equations with combined nonlinearities

arXiv:2610.37814v1 Announce Type: new Abstract: We introduce a new variational framework for the study of standing waves for nonlinear Schr\"odinger equations with combined power nonlinearities. The approach is based on minimizing the mass functional over a set defined by an upper bound on the energy and a lower bound on a nonlinear potential term, rather than minimizing the energy at prescribed mass. This yields a new characterization of the sharp Gagliardo--Nirenberg optimizer through purely variational constraints. As a consequence, we establish the existence of minimizers for all energy levels below a critical threshold and derive the corresponding Euler--Lagrange equations. These minimizers give rise to standing-wave solutions of the nonlinear Schr\"oedinger equation

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