Title

Spectral Theory for Discrete Laplacians

Authors

Authors

D. E. Dutkay;P. E. T. Jorgensen

Comments

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Abbreviated Journal Title

Complex Anal. Oper. Theory

Keywords

Operators in Hilbert space; discrete Laplacians; infinite graphs; spectral representation; spectral measures; multiplicity tables; semicircle laws; rank-one perturbations; spectrum; absolutely; continuous; graph Laplacian; electrical network; RANK-ONE PERTURBATIONS; SINGULAR CONTINUOUS-SPECTRUM; CATALAN NUMBERS; HILBERT-SPACE; OPERATORS; DIMENSIONS; TREES; SUBSPACES; H-2-CLASS; MATRICES; Mathematics, Applied; Mathematics

Abstract

We give the spectral representation for a class of selfadjoint discrete graph Laplacians Delta, with Delta depending on a chosen graph G and a conductance function c defined on the edges of G. We show that the spectral representations for Delta fall in two model classes, (1) tree-graphs with N-adic branching laws, and (2) lattice graphs. We show that the spectral theory of the first class may be computed with the use of rank-one perturbations of the real part of the unilateral shift, while the second is analogously built up with the use of the bilateral shift. We further analyze the effect on spectra of the conductance function c: How the spectral representation of Delta depends on c. Using Delta(G), we introduce a resistance metric, and we show that it embeds isometrically into an energy Hilbert space. We introduce an associated random walk and we calculate return probabilities, and a path counting number.

Journal Title

Complex Analysis and Operator Theory

Volume

4

Issue/Number

1

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

1

Last Page

38

WOS Identifier

WOS:000277137200001

ISSN

1661-8254

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