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arXiv 2108.09614math.OA
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高维非交换环面的Toeplitz扩张的平衡

Equilibrium on Toeplitz extensions of higher dimensional noncommutative tori

Zahra Afsar, Marcelo Laca, Jacqui Ramagge, Camila F. Sehnem

摘要:

由$2$ -上圈扭曲的$\mathbb{N}^n$的左正则表示生成的C*-代数是$n$维非对易环面的Toeplitz扩张,其上的每个向量$r \in [0,\infty)^n$确定规范作用量的一个单参数子群.我们表明,所得到的C*-动力系统的平衡态参数化的非交换环面对应的限制的上循环的消失坐标的$r$的tracial状态。这些反过来对应于概率测度上的经典环面,其尺寸取决于一定的退化指数的限制上循环。我们的研究结果概括了相变的Toeplitz非对易环面作为积木在最近的工作Brownlowe,霍金斯和西姆斯,和Afsar,休夫,雷伯恩和西姆斯。

英文摘要:

The C*-algebra generated by the left-regular representation of $\mathbb{N}^n$ twisted by a $2$-cocycle is a Toeplitz extension of an $n$-dimensional noncommutative torus, on which each vector $r \in [0,\infty)^n$ determines a one-parameter subgroup of the gauge action. We show that the equilibrium states of the resulting C*-dynamical system are parametrised by tracial states of the noncommutative torus corresponding to the restriction of the cocycle to the vanishing coordinates of $r$. These in turn correspond to probability measures on a classical torus whose dimension depends on a certain degeneracy index of the restricted cocycle. Our results generalise the phase transition on the Toeplitz noncommutative tori used as building blocks in recent work of Brownlowe, Hawkins and Sims, and of Afsar, an Huef, Raeburn and Sims.

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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