Spectrum of the Laplacian on a covering graph with pendant edges I: The one-dimensional lattice and beyond |
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Authors: | Akito Suzuki |
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Institution: | Department of Mathematics, Faculty of Engineering, Shinshu University, Wakasato, Nagano 380, Japan |
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Abstract: | In this paper, we examine covering graphs that are obtained from the d -dimensional integer lattice by adding pendant edges. In the case of d=1, we show that the Laplacian on the graph has a spectral gap and establish a necessary and sufficient condition under which the Laplacian has no eigenvalues. In the case of d=2, we show that there exists an arrangement of the pendant edges such that the Laplacian has no spectral gap. |
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Keywords: | 47B39 81Q10 39A12 |
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