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The one phase free boundary problem for the $p$-Laplacian with non-constant Bernoulli boundary condition


Authors: Antoine Henrot and Henrik Shahgholian
Journal: Trans. Amer. Math. Soc. 354 (2002), 2399-2416
MSC (1991): Primary 35R35, 35J70, 76S05
DOI: https://doi.org/10.1090/S0002-9947-02-02892-1
Published electronically: February 14, 2002
MathSciNet review: 1885658
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Abstract: Our objective, here, is to generalize our earlier results on the existence of classical convex solution to a free boundary problem with a Bernoulli-type boundary gradient condition and with the $p$-Laplacian as the governing operator. The main theorems of this paper assert that the exterior and the interior free boundary problem with a Bernoulli law, i.e. with a prescribed pressure $a(x)$ on the ``free'' streamline of the flow, have convex solutions provided the initial domains are convex. The continuous function $a(x)$ is subject to certain convexity properties. In our earlier results we have considered the case of constant $a(x)$. In the lines of the proof of the main results we also prove the semi-continuity (up to the boundary) of the gradient of the $p$-capacitary potentials in convex rings, with $C^1$ boundaries.


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Additional Information

Antoine Henrot
Affiliation: Ecole des Mines and Institut Elie Cartan, UMR CNRS 7502 and INRIA BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France
Email: henrot@iecn.u-nancy.fr

Henrik Shahgholian
Affiliation: Department of Mathematics, Royal Institute of Technology, 100 44 Stockholm, Sweden
Email: henriks@math.kth.se

DOI: https://doi.org/10.1090/S0002-9947-02-02892-1
Keywords: Free boundary, convexity, non-linear joining conditions
Received by editor(s): July 14, 2000
Received by editor(s) in revised form: August 16, 2001
Published electronically: February 14, 2002
Additional Notes: The first author thanks Göran Gustafsson Foundation for several visiting appointments to RIT in Stockholm
The second author was partially supported by the Swedish Natural Science Research Council and STINT. He also thanks Institute Elie Cartan for their hospitality. Both authors thank A. Petrosyan for some crucial remarks
Article copyright: © Copyright 2002 American Mathematical Society

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