On ground states for the 2D Schrodinger equation with combined nonlinearities and harmonic potential

Rémi Carles (1) , Yavdat Ilyasov (2, 3)

1 IRMAR - Institut de Recherche Mathématique de Rennes
2 Institute of Mathematics
3 Instituto de Matemática

We consider the nonlinear Schrödinger equation with a harmonic potential in the presence of two combined energy-subcritical power nonlinearities. We assume that the larger power is defocusing, and the smaller power is focusing. Such a framework includes physical models, and ensures that finite energy solutions are global in time. We address the questions of the existence and the orbital stability of standing waves. Given the mathematical features of the equation (external potential and inhomogeneous nonlinearity), the set of parameters for which standing waves exist in unclear. In the twodimensional case, we adapt the method of fundamental frequency solutions, introduced by the second author in the higher dimensional case without potential. This makes it possible to describe accurately the set of fundamental frequency standing waves and ground states, and to prove its orbital stability.

Domaines: Equations aux dérivées partielles [math.AP]; Physique mathématique [math-ph]

Rémi Carles, Yavdat Ilyasov. On ground states for the 2D Schrodinger equation with combined nonlinearities and harmonic potential. 2021. ⟨hal-03375507v1⟩