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arXiv 1907.03035math-phmath.CAmath.MPmath.SP
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量子图谱的解析性与Dirichlet-to-Neumann算子技巧

Analyticity of the spectrum and Dirichlet-to-Neumann operator technique for quantum graphs

Peter Kuchment, Jia Zhao

摘要:

在以前的一些工作中,建立了量子图算子的谱的解析结构作为图的顶点条件和其他参数的函数。然而,在所有可能的顶点条件的格拉斯曼上使用了一个特定的局部坐标图,从而造成了一种错误的印象,即在图表的边界处可能发生“错误”。在这里,我们表明,解析的相应的“色散关系”持有整个格拉斯曼,以及其他参数空间。我们还讨论了Dirichlet到Neumann(DtN)技术,将量子和离散图算子联系起来,这使得人们可以将一些结果从离散转移到量子图的情况下,但在Dirichlet谱上存在问题。我们的结论是,这种困难,在第一部分的文件,源于使用特定的坐标在格拉斯曼,并显示如何避免它扩展到一般情况下的一些随之而来的结果。

英文摘要:

In some previous works, the analytic structure of the spectrum of a quantum graph operator as a function of the vertex conditions and other parameters of the graph was established. However, a specific local coordinate chart on the Grassmanian of all possible vertex conditions was used, thus creating an erroneous impression that something ``wrong'' can happen at the boundaries of the chart. Here we show that the analyticity of the corresponding ``dispersion relation'' holds over the whole Grassmannian, as well as over other parameter spaces. We also address the Dirichlet-to-Neumann (DtN) technique of relating quantum and discrete graph operators, which allows one to transfer some results from the discrete to the quantum graph case, but which has issues at the Dirichlet spectrum. We conclude that this difficulty, as in the first part of the paper, stems from the use of specific coordinates in a Grassmannian and show how to avoid it to extend some of the consequent results to the general situation.

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