| HAL : hal-00576289, version 1 |
| arXiv : 0801.2142 |
| Fiche détaillée | Récupérer au format |
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| Maximization of the second positive Neumann eigenvalue for planar domains |
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| Alexandre Girouard 1Nikolai Nadirashvili 2 |
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| (28/01/2008) |
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| We prove that the second positive Neumann eigenvalue of a bounded simply-connected planar domain of a given area does not exceed the first positive Neumann eigenvalue on a disk of a twice smaller area. This estimate is sharp and attained by a sequence of domains degenerating to a union of two identical disks. In particular, this result implies the Polya conjecture for the second Neumann eigenvalue. The proof is based on a combination of analytic and topological arguments. As a by-product of our method we obtain an upper bound on the second eigenvalue for conformally round metrics on odd-dimensional spheres. |
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| 1 : | Laboratoire de Mathématiques |
| Université de Neuchatel | |
| 2 : | Laboratoire d'Analyse, Topologie, Probabilités (LATP) |
| CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III | |
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| Domaine | : | Mathématiques/Théorie spectrale |
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| Lien vers le texte intégral : |
| hal-00576289, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00576289 | |
| oai:hal.archives-ouvertes.fr:hal-00576289 | |
| Contributeur : Alexandre Girouard | |
| Soumis le : Lundi 14 Mars 2011, 09:47:22 | |
| Dernière modification le : Lundi 14 Mars 2011, 09:47:22 | |