Variations of Constrained Domain Functionals Associated With Boundary-Value Problems

Document Type

Article

Publication Date

3-1-2001

Identifier/URL

40990517 (Pure)

Abstract

We study variational formulas for maximizers for domain functionalsF(x0, u(x0)), x0∈Ώ, and ∫ΏF(x,u(x))dxover all Lipschitz domains Ώ satisfying the constraint∫Ώg(x) dx=1. Here, u is the solution ofa diffusion equation in Ώ. Functional variations arecomputed using domain variations which preserve the constraint exactly. Weshow that any maximizer solves a moving boundary problem for the diffusionequation. Further, we show that, for problems with symmetry, the optimaldomains Ώ are balls.

DOI

10.1023/A:1017587408883

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