Orbital stability of black solitons for quasilinear Schrödinger equations with nonzero conditions at infinity
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866918499729801216 |
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| author | Quiniou, Erwan Le |
| author_facet | Quiniou, Erwan Le |
| contents | We investigate the orbital stability of black solitons for a broad class of quasilinear Schrödinger equations in one space dimension, with nonzero boundary conditions at infinity. Namely, our framework handles general defocusing semilinear nonlinearities and focusing or defocusing quasilinear nonlinearities. First, we establish sufficient conditions on the quasi-linear nonlinearities ensuring the existence of a local branch of finite-energy solitons parameterized by their speed. Within this branch, the black soliton, also called kink, corresponds to the stationary solution. Our main result is the orbital stability of the black soliton in the energy space, provided that the Vakhitov-Kolokolov (VK) slope condition holds; namely, that the derivative of the momentum with respect to the speed is negative at zero. Moreover, we derive an explicit formula for verifying this VK condition. The proof relies on the analysis of a carefully designed variational problem, which allows us to control the sup-norm of the evolution of a perturbation of the kink in terms of the energy and momentum, both of which are conserved by the flow. A delicate part of the argument is the analysis of minimizing sequences for this variational problem, since the infimum is not attained. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13629 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Orbital stability of black solitons for quasilinear Schrödinger equations with nonzero conditions at infinity Quiniou, Erwan Le Analysis of PDEs 35Q55, 35C07, 35C08, 35J62, 35B35, 35Q60, 82D50, 35Q56, 37K40, 34B40 We investigate the orbital stability of black solitons for a broad class of quasilinear Schrödinger equations in one space dimension, with nonzero boundary conditions at infinity. Namely, our framework handles general defocusing semilinear nonlinearities and focusing or defocusing quasilinear nonlinearities. First, we establish sufficient conditions on the quasi-linear nonlinearities ensuring the existence of a local branch of finite-energy solitons parameterized by their speed. Within this branch, the black soliton, also called kink, corresponds to the stationary solution. Our main result is the orbital stability of the black soliton in the energy space, provided that the Vakhitov-Kolokolov (VK) slope condition holds; namely, that the derivative of the momentum with respect to the speed is negative at zero. Moreover, we derive an explicit formula for verifying this VK condition. The proof relies on the analysis of a carefully designed variational problem, which allows us to control the sup-norm of the evolution of a perturbation of the kink in terms of the energy and momentum, both of which are conserved by the flow. A delicate part of the argument is the analysis of minimizing sequences for this variational problem, since the infimum is not attained. |
| title | Orbital stability of black solitons for quasilinear Schrödinger equations with nonzero conditions at infinity |
| topic | Analysis of PDEs 35Q55, 35C07, 35C08, 35J62, 35B35, 35Q60, 82D50, 35Q56, 37K40, 34B40 |
| url | https://arxiv.org/abs/2605.13629 |