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arXiv 1012.3215math-phmath.MP
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Levinson定理与Aharonov-Bohm算子的高次迹

Levinson's theorem and higher degree traces for Aharonov-Bohm operators

J. Kellendonk, K. Pankrashkin, S. Richard

摘要:

从不同的角度研究了Aharonov-Bohm模型族的Levinson型定理。第一个是纯粹的分析,涉及明确计算的波运营商,并允许精确地确定各种贡献的左手边列文森定理,即那些由于散射运营商,在0-能源和无限能源的条款。第二个是基于非交换拓扑,揭示了列文森定理的拓扑性质。然后,我们将族中的参数纳入拓扑描述中,得到一种新的Levinson定理,即高次Levinson定理。在这种情况下,陈数的束定义的一个家庭的束缚态的投影明确计算和相关的3-跟踪应用于散射部分的模型的结果。

英文摘要:

We study Levinson type theorems for the family of Aharonov-Bohm models from different perspectives. The first one is purely analytical involving the explicit calculation of the wave-operators and allowing to determine precisely the various contributions to the left hand side of Levinson's theorem, namely those due to the scattering operator, the terms at 0-energy and at infinite energy. The second one is based on non-commutative topology revealing the topological nature of Levinson's theorem. We then include the parameters of the family into the topological description obtaining a new type of Levinson's theorem, a higher degree Levinson's theorem. In this context, the Chern number of a bundle defined by a family of projections on bound states is explicitly computed and related to the result of a 3-trace applied on the scattering part of the model.

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