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December, 2005 Potential Theory for Schröodinger operators on finite networks
Enrique Bendito, Ángeles Carmona, Andrés M. Encinas
Rev. Mat. Iberoamericana 21(3): 771-818 (December, 2005).


We aim here at analyzing the fundamental properties of positive semidefinite Schrödinger operators on networks. We show that such operators correspond to perturbations of the combinatorial Laplacian through 0-order terms that can be totally negative on a proper subset of the network. In addition, we prove that these discrete operators have analogous properties to the ones of elliptic second order operators on Riemannian manifolds, namely the monotonicity, the minimum principle, the variational treatment of Dirichlet problems and the condenser principle. Unlike the continuous case, a discrete Schrödinger operator can be interpreted as an integral operator and therefore a discrete Potential Theory with respect to its associated kernel can be built. We prove that the Schrödinger kernel satisfies enough principles to assure the existence of equilibrium measures for any proper subset. These measures are used to obtain systematic expressions of the Green and Poisson kernels associated with Dirichlet problems.


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Enrique Bendito. Ángeles Carmona. Andrés M. Encinas. "Potential Theory for Schröodinger operators on finite networks." Rev. Mat. Iberoamericana 21 (3) 771 - 818, December, 2005.


Published: December, 2005
First available in Project Euclid: 11 January 2006

zbMATH: 1102.31011
MathSciNet: MR2231010

Primary: 31C20 , 34B45

Keywords: combinatorial Laplacian , Dirichlet forms , discrete potential theory , Effective resistance , equilibrium measures , Green kernel , Poisson kernel , Schrödinger operators

Rights: Copyright © 2005 Departamento de Matemáticas, Universidad Autónoma de Madrid


Vol.21 • No. 3 • December, 2005
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