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arXiv 1004.1980math-phmath.MPmath.SPquant-ph
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关于径向树图上薛定谔算子不存在绝对连续谱

On the absence of absolutely continuous spectra for Schrödinger operators on radial tree graphs

Pavel Exner, Jiri Lipovsky

摘要:

本文的主题是薛定谔算子的树图是径向的分支数$b_n$在所有顶点的距离$t_n$从根。我们考虑一族以$(b_n-1)^2+4$实参数为特征的顶点耦合条件。我们证明了,如果图是稀疏的,有一个子序列的$\{t_{n+1}-t_n\}$增长到无穷大,在没有潜在的绝对连续谱是空的一个大的子集,这些顶点耦合,但在另一方面,有情况下,这样的薛定谔算子的谱可以是纯粹绝对连续的。

英文摘要:

The subject of the paper are Schrödinger operators on tree graphs which are radial having the branching number $b_n$ at all the vertices at the distance $t_n$ from the root. We consider a family of coupling conditions at the vertices characterized by $(b_n-1)^2+4$ real parameters. We prove that if the graph is sparse so that there is a subsequence of $\{t_{n+1}-t_n\}$ growing to infinity, in the absence of the potential the absolutely continuous spectrum is empty for a large subset of these vertex couplings, but on the the other hand, there are cases when the spectrum of such a Schrödinger operator can be purely absolutely continuous.

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