On nodal sets and nodal domains on S 2 and 2
[Sur les ensembles nodaux et les domaines nodaux sur S 2 et 2 ]
Annales de l'Institut Fourier, Tome 57 (2007) no. 7, pp. 2345-2360.

On étudie les configurations topologiques possibles d’ensembles nodaux, en particulier, le nombre de leurs composantes, pour les harmoniques sphériques sur S 2 . Nous construisons aussi une solution de l’équation Δu=u dans  2 qui possède seulement deux domaines nodaux. Cette équation est considérée dans l’étude des fonctions propres à haute énergie.

We discuss possible topological configurations of nodal sets, in particular the number of their components, for spherical harmonics on S 2 . We also construct a solution of the equation Δu=u in 2 that has only two nodal domains. This equation arises in the study of high energy eigenfunctions.

DOI : 10.5802/aif.2335
Classification : 58J50, 11J70, 35P20, 81Q50
Keywords: Laplacian, nodal sets, nodal domains, spherical harmonic, topological configuration
Mot clés : Laplacien, ensemble nodaux, domaines nodaux, harmonique sphérique, configuration topologique

Eremenko, Alexandre 1 ; Jakobson, Dmitry 2 ; Nadirashvili, Nikolai 3

1 Purdue University Mathematics Department 150 N University Street West Lafayette, IN 47907-2067 (USA)
2 McGill University Department of Mathematics and Statistics 805 Sherbrooke Str.West Montreal, QC H3A 2K6 (Canada)
3 Université de Provence Laboratoire d’Analyse, Topologie, Probabilités UMR 6632 Centre de Mathématiques et Informatique 39 rue F.Joliot-Curie 13453 Marseille Cedex 13 (France)
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     title = {On nodal sets and nodal domains on $\mathbf{S^2}$ and ${\mathbb{R}}^{\mathbf{2}}$},
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Eremenko, Alexandre; Jakobson, Dmitry; Nadirashvili, Nikolai. On nodal sets and nodal domains on $\mathbf{S^2}$ and ${\mathbb{R}}^{\mathbf{2}}$. Annales de l'Institut Fourier, Tome 57 (2007) no. 7, pp. 2345-2360. doi : 10.5802/aif.2335. https://aif.centre-mersenne.org/articles/10.5802/aif.2335/

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