Vol. 250, No. 2, 2011

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On an overdetermined elliptic problem

Laurent Hauswirth, Frédéric Hélein and Frank Pacard

Vol. 250 (2011), No. 2, 319–334
Abstract

A smooth flat Riemannian manifold is called an exceptional domain if it admits positive harmonic functions having vanishing Dirichlet boundary data and constant (nonzero) Neumann boundary data. In analogy with minimal surfaces, a representation formula is derived and applied to the classification of exceptional domains. Some interesting open problems are proposed along the way.

Keywords
harmonic function, overdetermined elliptic problem, extremal domain, minimal surface
Mathematical Subject Classification 2000
Primary: 35N25, 35J25, 35R35
Secondary: 53A10
Milestones
Received: 4 January 2010
Accepted: 12 April 2010
Published: 31 March 2011
Authors
Laurent Hauswirth
Université Paris-Est Marne-la-Vallée
Laboratoire d’Analyse et Mathématiques Appliquées
Cité Descartes
5 Boulevard Descartes
Champs-sur-Marne
77454 Marne-la-Vallée Cedex 2
France
http://perso-math.univ-mlv.fr/users/hauswirth.laurent
Frédéric Hélein
Université Paris Diderot–Paris 7
Institut de Mathématiques de Jussieu, UMR CNRS 7586
UFR de Mathématiques, Case 7012
Bâtiment Chevaleret
75205 Paris Cedex 13
France
http://www.math.jussieu.fr/~helein/
Frank Pacard
Institut Universitaire de France et Centre de Mathématiques Laurent Schwartz
UMR CNRS 7640
École Polytechnique
91128 Palaiseau
France
http://www.math.polytechnique.fr/~pacard