| HAL : hal-00398799, version 1 |
| arXiv : 0906.4540 |
| Fiche détaillée | Récupérer au format |
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| The Szegö Cubic Equation |
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| Patrick Gérard 1Sandrine Grellier 2 |
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| (24/06/2009) |
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| We consider the following Hamiltonian equation on the $L^2$ Hardy space on the circle, $$i\partial _tu=\Pi(|u|^2u)\ ,$$ where $\Pi $ is the Szegö projector. This equation can be seen as a toy model for totally non dispersive evolution equations. We display a Lax pair structure for this equation. We prove that it admits an infinite sequence of conservation laws in involution, and that it can be approximated by a sequence of finite dimensional completely integrable Hamiltonian systems. We establish several instability phenomena illustrating the degeneracy of this completely integrable structure. We also classify the traveling waves for this system. |
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| 1 : | Laboratoire de Mathématiques d'Orsay (LM-Orsay) |
| CNRS : UMR8628 – Université Paris XI - Paris Sud | |
| 2 : | Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO) |
| Université d'Orléans – CNRS : UMR7349 | |
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| Domaine | : | Mathématiques/Variables complexes Mathématiques/Equations aux dérivées partielles |
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| Nonlinear Schrödinger equations – Integrable Hamiltonian systems – Lax pairs – Hankel operators |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00398799, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00398799 | |
| oai:hal.archives-ouvertes.fr:hal-00398799 | |
| Contributeur : Sandrine Grellier | |
| Soumis le : Mercredi 24 Juin 2009, 19:33:13 | |
| Dernière modification le : Mercredi 24 Juin 2009, 20:33:33 | |