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arXiv math/0311425math.OAmath.KT
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来自Anzai流的$C^\ast$ -代数及其$K$ -群

$C^\ast$-algebras from Anzai flows and their $K$-groups

Kamran Reihani, Paul Milnes

摘要:

研究$n$ -维环面$\mathbb{T}^n$上的Anzai流生成的$C^{*}$ -代数$\mathcal{A}_{n,θ}$.证明了该代数是$(n+2)$ -维连通单连通幂零李群$F_n$的格子群$\mathfrak{D}_n$的群$C^{*}$ -代数的单商,而$C^{*}$-代数对应的李代数是一般丝状李代数$\mathfrak{f}_{n}$ . $C^{*}(\mathfrak{D}_n)$的其他单无限维代数也被刻画和表示为低维环面上的单仿射Furstenberg变换群$C^*$ -代数上的矩阵代数。研究了$\mathcal{A}_{n,θ}$的$K$ -群和$C^{*}(\mathfrak{D}_n)$的其它单等价群,Pimsner-Voiculescu六项正合列是一个有用的工具.尽可能明确地研究了$\mathcal{A}_{n,θ}$的$K$ -群的秩,并证明了它与$\mathbb{T}^n$的更一般的变换群$C^*$ -代数的秩相同,包括Furstenberg变换群\text{$C^*$-algebras} $A_{F_{f,θ}}$ .一个错误(关于这些$K$ -组)在文献中得到解决。

英文摘要:

We study the $C^{*}$-algebra $\mathcal{A}_{n,θ}$ generated by the Anzai flow on the $n$-dimensional torus $\mathbb{T}^n$. It is proved that this algebra is a simple quotient of the group $C^{*}$-algebra of a lattice subgroup $\mathfrak{D}_n$ of a $(n+2)$-dimensional connected simply connected nilpotent Lie group $F_n$ whose corresponding Lie algebra is the generic filiform Lie algebra $\mathfrak{f}_{n}$. Other simple infinite dimensional quotients of $C^{*}(\mathfrak{D}_n)$ are also characterized and represented as matrix algebras over simple affine Furstenberg transformation group $C^*$-algebras of the lower dimensional tori. The $K$-groups of the $\mathcal{A}_{n,θ}$ and other simple quotients of $C^{*}(\mathfrak{D}_n)$ are studied, the Pimsner-Voiculescu 6-term exact sequence being a useful tool. The rank of the $K$-groups of $\mathcal{A}_{n,θ}$ is studied as explicitly as possible, and is proved to be the same as for more general transformation group $C^*$-algebras of $\mathbb{T}^n$ including the Furstenberg transformation group \text{$C^*$-algebras} $A_{F_{f,θ}}$. An error (about these $K$-groups) in the literature is addressed.

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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