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- W3102806553 abstract "We investigate the bottom of the spectra of infinite quantum graphs, i.e., Laplace operators on metric graphs having infinitely many edges and vertices. We introduce a new definition of the isoperimetric constant for quantum graphs and then prove the Cheeger-type estimate. Our definition of the isoperimetric constant is purely combinatorial and thus it establishes connections with the combinatorial isoperimetric constant, one of the central objects in spectral graph theory and in the theory of simple random walks on graphs. The latter enables us to prove a number of criteria for quantum graphs to be uniformly positive or to have purely discrete spectrum. We demonstrate our findings by considering trees, antitrees and Cayley graphs of finitely generated groups." @default.
- W3102806553 created "2020-11-23" @default.
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- W3102806553 date "2018-12-06" @default.
- W3102806553 modified "2023-09-26" @default.
- W3102806553 title "Spectral estimates for infinite quantum graphs" @default.
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- W3102806553 doi "https://doi.org/10.1007/s00526-018-1454-3" @default.
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