Asymptotically full measure sets of almost-periodic solutions for the NLS equation
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910800797499392 |
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| author | Biasco, Luca Corsi, Livia Gentile, Guido Procesi, Michela |
| author_facet | Biasco, Luca Corsi, Livia Gentile, Guido Procesi, Michela |
| contents | We study the dynamics of solutions for a family of nonlinear Schroedinger equations on the circle, with a smooth convolution potential and Gevrey regular initial data. Our main result is the construction of an asymptotically full measure set of small-amplitude time almost-periodic solutions, which are dense on invariant tori. In regions corresponding to positive actions, we prove that such maximal invariant tori are Banach manifolds, which provide a Cantor foliation of the phase space. As a consequence, we establish that, for many small initial data, the Gevrey norm of the solution remains approximately constant for all time and hence the elliptic fixed point at the origin is Lyapunov statistically stable. This is first result in KAM Theory for PDEs that regards the persistence of a large measure set of invariant tori and hence may be viewed as a strict extension to the infinite dimensional setting of the classical KAM theorem. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_02648 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Asymptotically full measure sets of almost-periodic solutions for the NLS equation Biasco, Luca Corsi, Livia Gentile, Guido Procesi, Michela Analysis of PDEs Dynamical Systems 37K55, 35B15, 35Q55, 35B20 We study the dynamics of solutions for a family of nonlinear Schroedinger equations on the circle, with a smooth convolution potential and Gevrey regular initial data. Our main result is the construction of an asymptotically full measure set of small-amplitude time almost-periodic solutions, which are dense on invariant tori. In regions corresponding to positive actions, we prove that such maximal invariant tori are Banach manifolds, which provide a Cantor foliation of the phase space. As a consequence, we establish that, for many small initial data, the Gevrey norm of the solution remains approximately constant for all time and hence the elliptic fixed point at the origin is Lyapunov statistically stable. This is first result in KAM Theory for PDEs that regards the persistence of a large measure set of invariant tori and hence may be viewed as a strict extension to the infinite dimensional setting of the classical KAM theorem. |
| title | Asymptotically full measure sets of almost-periodic solutions for the NLS equation |
| topic | Analysis of PDEs Dynamical Systems 37K55, 35B15, 35Q55, 35B20 |
| url | https://arxiv.org/abs/2412.02648 |