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arXiv 0912.3056math.FA
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高阶谱移函数

Spectral shift function of higher order

Denis Potapov, Anna Skripka, Fedor Sukochev

摘要:

本文肯定地解决了Koplienko于1984年提出的关于高阶谱移测度存在性的猜想。此外,本文建立了这些措施的绝对连续性,从而存在的高阶谱移位函数$η_n$。证明了高阶谱移函数是一个$L^1$ -函数,并证明了它的$L^1$ -模的一个估计. Krein在1953年和Koplienko在1984年分别建立了$η_1$和$η_2$的存在性和可求和性,而对于$n > 2$,这个问题没有得到解决。我们的方法来自[arXiv:0904.4095];它也适用于扰动理论的一般半有限冯诺依曼代数设置。

英文摘要:

This paper resolves affirmatively Koplienko's conjecture of 1984 on existence of higher order spectral shift measures. Moreover, the paper establishes absolute continuity of these measures and, thus, existence of the higher order spectral shift functions $η_n$. We show the higher order spectral shift function is a $L^1$-function and prove an estimate on its $L^1$-norm. Existence and summability of $η_1$ and $η_2$ were established by Krein in 1953 and Koplienko in 1984, respectively, whereas for $n > 2$ the problem was unresolved. Our method is derived from [arXiv:0904.4095]; it also applies to the general semi-finite von Neumann algebra setting of the perturbation theory.

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