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arXiv 2406.12342math-phmath.MP
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自旋晶格系统上的经典与量子 KMS 态

Classical and quantum KMS states on spin lattice systems

Nicolò Drago, Lorenzo Pettinari, Christiaan J. F. van de Ven

AI总结:

本文通过推广 Berezin 严格形变量子化到自旋晶格系统,证明量子 KMS 态的经典极限满足经典 KMS 条件,并给出保证经典与量子 KMS 态唯一性的充分条件。

摘要:

我们在自旋晶格系统的背景下研究经典与量子 KMS 条件。具体而言,我们为 $\mathbb{Z}^d$ 上取值于 $\mathbb{S}^2$ 的自旋晶格系统定义了一种严格形变量子化(SDQ),推广了著名的单球面 Berezin SDQ。这使得经典可观测量代数上的经典动力学能够提升为量子可观测量代数上的量子动力学。随后,我们通过证明量子 KMS 态序列的任意弱*极限点都满足经典 KMS 条件,来比较经典热平衡与量子热平衡的概念。简言之,这证明了量子热态的经典极限描述经典热平衡,从而强化了经典 KMS 条件的物理解释。最后,我们给出了两个保证经典与量子 KMS 态唯一性的充分条件:后者基于适用于所研究系统的 Kirkwood-Salzburg 方程的一个版本。由此我们确定了一个温和条件,该条件确保在共同的足够高温度下,经典 KMS 态以及量子化动力学的量子 KMS 态具有唯一性。

英文摘要:

We study the classical and quantum KMS conditions within the context of spin lattice systems. Specifically, we define a strict deformation quantization (SDQ) for a $\mathbb{S}^2$-valued spin lattice system over $\mathbb{Z}^d$ generalizing the renown Berezin SDQ for a single sphere. This allows to promote a classical dynamics on the algebra of classical observables to a quantum dynamics on the algebra of quantum observables. We then compare the notion of classical and quantum thermal equilibrium by showing that any weak*-limit point of a sequence of quantum KMS states fulfils the classical KMS condition. In short, this proves that the semiclassical limit of quantum thermal states describes classical thermal equilibrium, strenghtening the physical interpretation of the classical KMS condition. Finally we provide two sufficient conditions ensuring uniqueness of classical and quantum KMS states: The latter are based on an version of the Kirkwood-Salzburg equations adapted to the system of interest. As a consequence we identify a mild condition which ensures uniqueness of classical KMS states and of quantum KMS states for the quantized dynamics for a common sufficiently high temperature.

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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