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arXiv 0901.1422math.OAmath.FA
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子产品系统

Subproduct systems

Orr Shalit, Baruch Solel

摘要:

引入了子积系统的概念,子积系统是积系统的推广。证明了CP-半群与对偶(X,T)之间本质上存在1对1的对应,其中X是子积系统,T是内射子积系统表示.对于子产品系统和子产品系统的单元,也有类似的陈述。这种对应关系被用来作为一个框架,发展膨胀理论的CP-半群。我们获得的结果:(i)相当一般半群上 *-自同态半群的 *-自守扩张:(ii)CP映射半群具有 *-自同态扩张的充要条件;(iii)一个类似于Parrot的三个收缩而没有等距扩张的例子,即三个交换的例子,B(H)上不允许 *-自同态扩张的压缩正规CP映射(从而解决了Bhat在1998年提出的一个公开问题)。特别注意的是半群N上的子积系统,它被用作研究满足齐次多项式关系的算子元组的框架,以及它们生成的算子代数。作为应用程序,我们得到了一个非交换(投影)Nullstellanet,一个模型的元组的运营商受齐次多项式关系,一个完整的描述所有表示松本的子移位C* 代数时,子移位是有限型,和分类的某些算子代数-包括一个有趣的非自伴推广的非交换环面。

英文摘要:

The notion of a subproduct system, a generalization of that of a product system, is introduced. We show that there is an essentially 1 to 1 correspondence between cp-semigroups and pairs (X,T) where X is a subproduct system and T is an injective subproduct system representation. A similar statement holds for subproduct systems and units of subproduct systems. This correspondence is used as a framework for developing a dilation theory for cp-semigroups. Results we obtain: (i) a *-automorphic dilation to semigroups of *-endomorphisms over quite general semigroups; (ii) necessary and sufficient conditions for a semigroup of CP maps to have a *-endomorphic dilation; (iii) an analogue of Parrot's example of three contractions with no isometric dilation, that is, an example of three commuting, contractive normal CP maps on B(H) that admit no *-endomorphic dilation (thereby solving an open problem raised by Bhat in 1998). Special attention is given to subproduct systems over the semigroup N, which are used as a framework for studying tuples of operators satisfying homogeneous polynomial relations, and the operator algebras they generate. As applications we obtain a noncommutative (projective) Nullstellansatz, a model for tuples of operators subject to homogeneous polynomial relations, a complete description of all representations of Matsumoto's subshift C*-algebra when the subshift is of finite type, and a classification of certain operator algebras -- including an interesting non-selfadjoint generalization of the noncommutative tori.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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