Quasi-isospectrality on quantum graphs

Details Quasi-isospectrality on quantum graphs Quasi-isospectrality on quantum graphs

2012-03-16

arxiv.org/abs/1203.3670v2

Mathematics

Spectral Theory

Scientific paper

Consider two quantum graphs with the standard Laplace operator and non-Robin type boundary conditions at all vertices. We show that if their eigenvalue-spectra agree everywhere aside from a sufficiently sparse set, then the eigenvalue-spectra and the length-spectra of the two quantum graphs are completely identical. Similarly if their length-spectra agree everywhere aside from a sufficiently sparse set, then the quantum graphs have the same eigenvalue-spectrum and length-spectrum.

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