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ISSN 1088-6850(e) ISSN 0002-9947(p)

Layer potential techniques in spectral analysis. Part I: Complete asymptotic expansions for eigenvalues of the Laplacian in domains with small inclusions

Author(s): Habib Ammari; Hyeonbae Kang; Mikyoung Lim; Habib Zribi
Journal: Trans. Amer. Math. Soc. 362 (2010), 2901-2922.
MSC (2000): Primary 35B30
Posted: January 5, 2010
MathSciNet review: 2592941
Retrieve article in: PDF

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Abstract: We provide a rigorous derivation of new complete asymptotic expansions for eigenvalues of the Laplacian in domains with small inclusions. The inclusions, somewhat apart from or nearly touching the boundary, are of arbitrary shape and arbitrary conductivity contrast vis-à-vis the background domain, with the limiting perfectly conducting inclusion. By integral equations, we reduce this problem to the study of the characteristic values of integral operators in the complex plane. Powerful techniques from the theory of meromorphic operator-valued functions and careful asymptotic analysis of integral kernels are combined for deriving complete asymptotic expansions for eigenvalues. Our asymptotic formulae in this paper may be expected to lead to efficient algorithms not only for solving shape optimization problems for Laplacian eigenvalues but also for determining specific internal features of an object based on scattering data measurements.

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