On the Free Boundary in Heterogeneous Obstacle-Type Problems with Two Phases
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- by J. F. Rodrigues
- St. Petersburg Math. J. 27 (2016), 495-508
- DOI: https://doi.org/10.1090/spmj/1400
- Published electronically: March 30, 2016
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Abstract:
Some properties of the solutions of free obstacle-type boundary problems with two phases are considered for a class of heterogeneous quasilinear elliptic operators, including the $p$-Laplacian operator with $1<p<\infty$. Under a natural nondegeneracy assumption on the interface, when the level set of the change of phase has null Lebesgue measure, a continuous dependence result is proved for the characteristic functions of each phase and sharp estimates are established on the variation of its Lebesgue measure with respect to the $L^1$-variation of the data, in a rather general framework. For elliptic quasilinear equations whose heterogeneities have appropriate integrable derivatives, it is shown that the characteristic functions of both phases are of bounded variation for the general data with bounded variation. This extends recent results for the obstacle problem and is a first result on the regularity of the free boundary of the heterogeneous two phases problem, which is therefore an interface locally of class $C^1$ up to a possible singular set of null perimeter.References
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Bibliographic Information
- J. F. Rodrigues
- Affiliation: University of Lisbon / CMAF-FCiĂȘncias, Lisbon, Portugal
- MR Author ID: 190027
- Email: jfrodrigues@ciencias.ulisboa.pt
- Received by editor(s): January 19, 2015
- Published electronically: March 30, 2016
- © Copyright 2016 American Mathematical Society
- Journal: St. Petersburg Math. J. 27 (2016), 495-508
- MSC (2010): Primary 35R35
- DOI: https://doi.org/10.1090/spmj/1400
- MathSciNet review: 3570963
Dedicated: Dedicated to Nina N. Uralâtseva on the occasion of her 80th birthday