Nonlocal problems with Neumann boundary conditions

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We introduce a new Neumann problem for the fractional Laplacian arising from a simple probabilistic consideration, and we discuss the basic properties of this model. We can consider both elliptic and parabolic equations in any domain. In addition, we formulate problems with nonhomogeneous Neumann conditions, and also with mixed Dirichlet and Neumann conditions, all of them having a clear probabilistic interpretation. We prove that solutions to the fractional heat equation with homogeneous Neumann conditions have the following natural properties: conservation of mass inside ω, decreasing energy, and convergence to a constant as t→∞. Moreover, for the elliptic case we give the variational formulation of the problem, and establish existence of solutions. We also study the limit properties and the boundary behavior induced by this nonlocal Neumann condition. For concreteness, one may think that our nonlocal analogue of the classical Neumann condition ∂νu = 0 on ∂ω consists in the nonlocal prescription ∫ ω u(x) - u(y)/|x - y|n+2s dy = 0 for x ∈ ℝn \ ω. We made an effort to keep all the arguments at the simplest possible technical level, in order to clarify the connections between the different scientific fields that are naturally involved in the problem, and make the paper accessible also to a wide, non-specialistic public (for this scope, we also tried to use and compare different concepts and notations in a somehow more unified way). © European Mathematical Society.
Original languageEnglish
Pages (from-to)377-416
Number of pages40
JournalRevista Matematica Iberoamericana
Volume33
Issue number2
DOIs
Publication statusPublished - 2017
Externally publishedYes

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Neumann Condition
Nonlocal Problems
Neumann Boundary Conditions
Fractional Laplacian
Nonlocal Conditions
Boundary Behavior
Dirichlet conditions
Neumann Problem
Variational Formulation
Heat Equation
Elliptic Equations
Notation
Parabolic Equation
Conservation
Existence of Solutions
Fractional
Analogue
Energy

Cite this

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title = "Nonlocal problems with Neumann boundary conditions",
abstract = "We introduce a new Neumann problem for the fractional Laplacian arising from a simple probabilistic consideration, and we discuss the basic properties of this model. We can consider both elliptic and parabolic equations in any domain. In addition, we formulate problems with nonhomogeneous Neumann conditions, and also with mixed Dirichlet and Neumann conditions, all of them having a clear probabilistic interpretation. We prove that solutions to the fractional heat equation with homogeneous Neumann conditions have the following natural properties: conservation of mass inside ω, decreasing energy, and convergence to a constant as t→∞. Moreover, for the elliptic case we give the variational formulation of the problem, and establish existence of solutions. We also study the limit properties and the boundary behavior induced by this nonlocal Neumann condition. For concreteness, one may think that our nonlocal analogue of the classical Neumann condition ∂νu = 0 on ∂ω consists in the nonlocal prescription ∫ ω u(x) - u(y)/|x - y|n+2s dy = 0 for x ∈ ℝn \ ω. We made an effort to keep all the arguments at the simplest possible technical level, in order to clarify the connections between the different scientific fields that are naturally involved in the problem, and make the paper accessible also to a wide, non-specialistic public (for this scope, we also tried to use and compare different concepts and notations in a somehow more unified way). {\circledC} European Mathematical Society.",
author = "Serena Dipierro and X. Ros-Oton and E. Valdinoci",
year = "2017",
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language = "English",
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journal = "Revista Matematica Iberoamericana",
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Nonlocal problems with Neumann boundary conditions. / Dipierro, Serena ; Ros-Oton, X.; Valdinoci, E.

In: Revista Matematica Iberoamericana, Vol. 33, No. 2, 2017, p. 377-416.

Research output: Contribution to journalArticle

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AB - We introduce a new Neumann problem for the fractional Laplacian arising from a simple probabilistic consideration, and we discuss the basic properties of this model. We can consider both elliptic and parabolic equations in any domain. In addition, we formulate problems with nonhomogeneous Neumann conditions, and also with mixed Dirichlet and Neumann conditions, all of them having a clear probabilistic interpretation. We prove that solutions to the fractional heat equation with homogeneous Neumann conditions have the following natural properties: conservation of mass inside ω, decreasing energy, and convergence to a constant as t→∞. Moreover, for the elliptic case we give the variational formulation of the problem, and establish existence of solutions. We also study the limit properties and the boundary behavior induced by this nonlocal Neumann condition. For concreteness, one may think that our nonlocal analogue of the classical Neumann condition ∂νu = 0 on ∂ω consists in the nonlocal prescription ∫ ω u(x) - u(y)/|x - y|n+2s dy = 0 for x ∈ ℝn \ ω. We made an effort to keep all the arguments at the simplest possible technical level, in order to clarify the connections between the different scientific fields that are naturally involved in the problem, and make the paper accessible also to a wide, non-specialistic public (for this scope, we also tried to use and compare different concepts and notations in a somehow more unified way). © European Mathematical Society.

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