Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 42, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/42/3/035101
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The exterior-interior duality expresses a deep connection between the Laplace spectrum in bounded and connected domains in R-2, and the scattering matrices in the exterior of the domains. Here, this link is extended to the study of the spectrum of the discrete Laplacian on finite graphs. For this purpose, two methods are devised for associating scattering matrices to the graphs. The exterior-interior duality is derived for both methods.
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