An index theorem for Schrödinger operators on metric graphs
An index theorem for Schrödinger operators on metric graphs
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DOI:
10.1090/conm/741/14922
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发表时间:
2018-09
期刊:
影响因子:
--
通讯作者:
Y. Latushkin;Selim Sukhtaiev
中科院分区:
文献类型:
--
作者:
Y. Latushkin;Selim Sukhtaiev
We show that the spectral flow of a one-parameter family of Schr\"odinger operators on a metric graph is equal to the Maslov index of a path of Lagrangian subspaces describing the vertex conditions. In addition, we derive an Hadamard-type formula for the derivatives of the eigenvalue curves via the Maslov crossing form.