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arXiv math/0512454math.OAmath.KT
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von Neumann Algebras中谱流的解析方法

An Analytic Approach to Spectral Flow in von Neumann Algebras

M-T. Benameur, A. L. Carey, J. Phillips, A. Rennie, F. A. Sukochev, K. P. Wojciechowski

摘要:

谱流的分析方法大约有十年的历史了。在这段时间里,它已经发展到涵盖更广泛的例子。最关键的扩展是在半有限von Neumann代数中用Breuer-弗雷德霍姆算子代替经典意义下的弗雷德霍姆算子。本文的第一部分简要介绍了这一理论,扩展和完善了以前的结果。然后,它适用于在后面的部分的文件,一系列的例子。其中最有力的工具是谱流的积分公式。这个积分公式是已知的狄拉克算子的各种形式以来的基本文件的阿蒂亚,帕托迪和辛格。这一论述的目的之一是与这部早期作品联系起来,以便人们能够在适当的历史背景下理解最近的发展。此外,我们展示了如何获得这些谱流公式的设置狄拉克运营商(非紧)覆盖空间的紧自旋流形使用绝热方法。最后,我们把我们的工作与Coburn,Douglas,Schaeffer和Singer关于具有概周期符号的Toeplitz算子的工作联系起来。我们推广他们的工作,以涵盖的情况下,矩阵值的几乎周期符号\R^N使用一些想法的舒宾。

英文摘要:

The analytic approach to spectral flow is about ten years old. In that time it has evolved to cover an ever wider range of examples. The most critical extension was to replace Fredholm operators in the classical sense by Breuer-Fredholm operators in a semifinite von Neumann algebra. The first part of this paper gives a brief account of this theory extending and refining earlier results. It is then applied in the latter parts of the paper to a series of examples. One of the most powerful tools is an integral formula for spectral flow. This integral formula was known for Dirac operators in a variety of forms ever since the fundamental papers of Atiyah, Patodi and Singer. One of the purposes of this exposition is to make contact with this early work so that one can understand the recent developments in a proper historical context. In addition we show how to derive these spectral flow formulae in the setting of Dirac operators on (non-compact) covering spaces of a compact spin manifold using the adiabatic method. Finally we relate our work to that of Coburn, Douglas, Schaeffer and Singer on Toeplitz operators with almost periodic symbol. We generalise their work to cover the case of matrix valued almost periodic symbols on \R^N using some ideas of Shubin.

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