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Article Dans Une Revue Journal of Mathematical Physics Année : 2011

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

Résumé

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 energy + infinity. 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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Dates et versions

hal-00660879 , version 1 (18-01-2012)

Identifiants

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Johannes Kellendonk, Konstantin Pankrashkin, Serge Richard. Levinson's theorem and higher degree traces for Aharonov-Bohm operators. Journal of Mathematical Physics, 2011, 52 (5), pp.052102. ⟨10.1063/1.3582943⟩. ⟨hal-00660879⟩
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