A free boundary problem related to thermal insulation

flat implies smooth

Research output: Contribution to journalArticle

Abstract

We study the regularity of the interface for a new free boundary problem introduced in Caffarelli and Kriventsov (A free boundary problem related to thermal insulation, 2015). We show that for minimizers of the functional F1(A,u)=∫A|∇u|2dLn+∫∂Au2+C¯Ln(A)over all pairs (A, u) of open sets A containing a fixed set Ω and functions u∈ H 1 (A) which equal 1 on Ω , the boundary ∂A locally coincides with the union of the graphs of two C 1 , α functions near most points. Specifically, this happens at all points where the interface is trapped between two planes which are sufficiently close together. The proof combines ideas introduced by Ambrosio, Fusco, and Pallara for the Mumford–Shah functional with new arguments specific to the problem considered.

Original languageEnglish (US)
Article number78
JournalCalculus of Variations and Partial Differential Equations
Volume58
Issue number2
DOIs
StatePublished - Apr 1 2019
Externally publishedYes

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Thermal insulation
Free Boundary Problem
Mumford-Shah Functional
Imply
Minimizer
Open set
Union
Regularity
Graph in graph theory

All Science Journal Classification (ASJC) codes

  • Analysis
  • Applied Mathematics

Cite this

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title = "A free boundary problem related to thermal insulation: flat implies smooth",
abstract = "We study the regularity of the interface for a new free boundary problem introduced in Caffarelli and Kriventsov (A free boundary problem related to thermal insulation, 2015). We show that for minimizers of the functional F1(A,u)=∫A|∇u|2dLn+∫∂Au2+C¯Ln(A)over all pairs (A, u) of open sets A containing a fixed set Ω and functions u∈ H 1 (A) which equal 1 on Ω , the boundary ∂A locally coincides with the union of the graphs of two C 1 , α functions near most points. Specifically, this happens at all points where the interface is trapped between two planes which are sufficiently close together. The proof combines ideas introduced by Ambrosio, Fusco, and Pallara for the Mumford–Shah functional with new arguments specific to the problem considered.",
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