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arXiv 1108.4577gr-qcmath-phmath.MPquant-ph
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圈量子引力的量子变量代数,I.概述

Algebras of Quantum Variables for Loop Quantum Gravity, I. Overview

Diana Kaminski

摘要:

算子代数框架在数学物理中起着重要的作用。例如,对于量子力学理论,存在许多不同的算子代数。在圈内量子引力只有两个代数已经介绍到现在。在"LQG的量子变量代数(AQV)“项目中,我们将对已知的完整通量 *-代数和Weyl C*-代数进行修改,提出并研究一组新的代数。构造这些代数的思想是建立一个有限的算子集,它生成(在Woronowicz,Schmüdgen和Inoue的意义上)量子引力的不同O*-或C*-代数,并使用这些代数的归纳极限。在圈量子引力方法中,基本的经典变量通常是联系和通量。在研究经典广义相对论的正则量子化中出现的三个约束时,在ADM形式主义中出现了一些其他变量,如曲率。因此,引力量子化的主要困难是找到一个合适的替代品的基本经典变量和约束。量子引力的代数被认为是由一组与完整性、通量以及在某些情况下甚至曲率相关的算子生成的。对于这个代数有两种合理的选择:量子引力的约束集合包含在这个代数中,或者至少这些约束与这个代数相关联。其次,量子变量的代数被称为物理的,如果它包含完整的可观测量。在“LQG的量子变量代数”项目中,将研究不同代数作为物理代数的性质。进一步讨论了这些代数上KMS-态的存在性。

英文摘要:

The operator algebraic framework plays an important role in mathematical physics. Many different operator algebras exist for example for a theory of quantum mechanics. In Loop Quantum Gravity only two algebras have been introduced until now. In the project about 'Algebras of Quantum Variables (AQV) for LQG' the known holonomy-flux *-algebra and the Weyl C*-algebra will be modified and a set of new algebras will be proposed and studied. The idea of the construction of these algebras is to establish a finite set of operators, which generates (in the sense of Woronowicz, Schmüdgen and Inoue) the different O*- or C*-algebras of quantum gravity and to use inductive limits of these algebras. In the Loop Quantum Gravity approach usually the basic classical variables are connections and fluxes. Studying the three constraints appearing in the canonical quantisation of classical general relativity in the ADM-formalism some other variables like curvature appear. Consequently the main difficulty of a quantisation of gravity is to find a suitable replacement of the set of elementary classical variables and constraints. The algebra of quantum gravity is supposed to be generated by a set of the operators associated to holonomies, fluxes and in some cases even the curvature. There are two reasonable choices for this algebra: The set of constraints of Quantum Gravity are contained in or at least the constraints are affilliated with this algebra. Secondly, the algebra of quantum variables is said to be physical if it contains complete observables. In the project of 'Algebras of Quantum Variables for LQG' different algebras will be studied with respect to the property of being a physical algebra. Furthermore the existence of KMS-states on these algebras will be argued.

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