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arXiv 0801.3365math-phgr-qchep-thmath.MP
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量子电荷和时空拓扑:新超选择扇区的出现

Quantum charges and spacetime topology: The emergence of new superselection sectors

Romeo Brunetti, Giuseppe Ruzzi

摘要:

其中发展了一种新形式的拓扑起源的超选择扇区。这意味着一个新的调查,包括多普利歇,哈格和罗伯茨在本地量子理论的传统框架的几个扩展。本文首先推广了C ~*-代数网表示的概念,然后采用一种具有强拓扑味的选择准则,给出了一种新的选择准则。我们证明,它是连贯的与旧的观点,因此一个真正的延伸的线索。在这方面,我们延长罗伯茨的上同调分析的情况下,1-cocycles承担非平凡的酉表示的基本组的时空,相当于其柯西表面的情况下,全球双曲。一个重要的工具是一个概念的群冯诺依曼代数产生的1-上循环评价循环在固定区域。证明了这些群vonNeumann代数是局部化在循环起始和结束的有界区域上的有限I型阶乘代数。所有这一切在拓扑意义上构成了一个新的不变量,它可以被定义为因子的维数。我们证明了任何1-上圈都可以分解为一个只包含电荷内容的部分和另一个只存储拓扑信息的部分。这第二部分很像什么在文学中被称为几何相位。事实上,非常几何起源的1-上循环,我们讨论的文件中,他们是必要的工具,在理论的网丛,和拓扑部分是相关的,其holonomy内容。最后证明了网表示的存在性。

英文摘要:

In which is developed a new form of superselection sectors of topological origin. By that it is meant a new investigation that includes several extensions of the traditional framework of Doplicher, Haag and Roberts in local quantum theories. At first we generalize the notion of representations of nets of C*-algebras, then we provide a brand new view on selection criteria by adopting one with a strong topological flavour. We prove that it is coherent with the older point of view, hence a clue to a genuine extension. In this light, we extend Roberts' cohomological analysis to the case where 1--cocycles bear non trivial unitary representations of the fundamental group of the spacetime, equivalently of its Cauchy surface in case of global hyperbolicity. A crucial tool is a notion of group von Neumann algebras generated by the 1-cocycles evaluated on loops over fixed regions. One proves that these group von Neumann algebras are localized at the bounded region where loops start and end and to be factorial of finite type I. All that amounts to a new invariant, in a topological sense, which can be defined as the dimension of the factor. We prove that any 1-cocycle can be factorized into a part that contains only the charge content and another where only the topological information is stored. This second part resembles much what in literature are known as geometric phases. Indeed, by the very geometrical origin of the 1-cocycles that we discuss in the paper, they are essential tools in the theory of net bundles, and the topological part is related to their holonomy content. At the end we prove the existence of net representations.

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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