Steklov-type eigenvalues associated with best Sobolev trace constants: domain perturbation and overdetermined systems

Details Steklov-type eigenvalues associated with best Sobolev trace constants: domain perturbation and overdetermined systems Steklov-type eigenvalues associated with best Sobolev trace constants: domain perturbation and overdetermined systems

2011-01-31

arxiv.org/abs/1101.5930v1

Mathematics

Analysis of PDEs

Scientific paper

We consider a variant of the classic Steklov eigenvalue problem, which arises in the study of the best trace constant for functions in Sobolev space. We prove that the elementary symmetric functions of the eigenvalues depend real-analytically upon variation of the underlying domain and we compute the corresponding Hadamard-type formulas for the shape derivatives. We also consider isovolumetric and isoperimetric domain perturbations and we characterize the corresponding critical domains in terms of appropriate overdetermined systems. Finally, we prove that balls are critical domains for the elementary symmetric functions of the eigenvalues subject to volume or perimeter constraint.

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