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arXiv 1711.02428math.SPmath-phmath.FAmath.MP
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无限量子图的谱估计

Spectral Estimates for Infinite Quantum Graphs

Aleksey Kostenko, Noema Nicolussi

摘要:

我们研究无限量子图的谱的底部,即,具有无穷多条边和无穷多个顶点的度量图上的Laplace算子。我们引入了量子图的等周常数的一个新定义,并证明了Cheeger型估计。我们的定义的等周常数是纯粹的组合,因此它建立了连接与组合等周常数,一个中心对象在谱图论和理论的简单随机游动的图。后者使我们能够证明量子图是一致正的或具有纯离散谱的一些准则。我们证明了我们的研究结果,考虑树,反树和凯莱图的有限生成群。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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