Solitons, scattering and blow-up for the nonlinear Schr\"odinger equation with combined power-type nonlinearities on $\mathbb{R}^d\times\mathbb{T}$

TL;DR

This paper studies the long-term behavior of nonlinear Schrödinger equations with combined power nonlinearities on a waveguide manifold, revealing new phenomena related to solitons, scattering, and blow-up solutions.

Contribution

It introduces a novel analysis of NLS with combined nonlinearities on , establishing new variational frameworks and periodic dependence results not seen in single-power models.

Findings

Characterization of soliton, scattering, and blow-up solutions.

Construction of two rescaled variational problem families.

Identification of periodic dependence on nonlinear parameters.

Abstract

We investigate the long time dynamics of the nonlinear Schr\"odinger equation (NLS) with combined powers on the waveguide manifold $\mathbb{R}^d\times\mathbb{T}$. Different from the previously studied NLS-models with single power on the waveguide manifolds, where the non-scale-invariance is mainly due to the mixed nature of the underlying domain, the non-scale-invariance of the present model is both geometrical and structural. By considering different combinations of the nonlinearities, we establish both qualitative and quantitative properties of the soliton, scattering and blow-up solutions. As one of the main novelties of the paper compared to the previous results for the NLS with single power, we particularly construct two different rescaled families of variational problems, which leads to an NLS with single power in different limiting profiles respectively, to establish the periodic dependence results.