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Schrödinger operator on homogeneous metric trees: spectrum in gaps | | A.V. Sobolev & M. Solomyak
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4 Sep 2001 | | Subject: | Spectral Theory MSC-class: Primary 34L20, 05C05; Secondary 34L40 | math.SP | | Abstract: | The paper studies the spectral properties of the Schrödinger operator $A_{gV} = A_0 + gV$ on a homogeneous rooted metric tree, with a decaying real-valued potential $V$ and a coupling constant $gge 0$. The spectrum of the free Laplacian $A_0 = -Delta$ has a band-gap structure with a single eigenvalue of infinite multiplicity in the middle of each finite gap. The perturbation $gV$ gives rise to extra eigenvalues in the gaps. These eigenvalues are monotone functions of $g$ if the potential $V$ has a fixed sign. Assuming that the latter condition is satisfied and that $V$ is symmetric, i.e. depends on the distance to the root of the tree, we carry out a detailed asymptotic analysis of the counting function of the discrete eigenvalues in the limit $g oinfty$. Depending on the sign and decay of $V$, this asymptotics is either of the Weyl type or is completely determined by the behaviour of $V$ at infinity. | | Source: | arXiv, math.SP/0109016 | | Services: | Forum | Review | PDF | Favorites | |
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