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arXiv 1105.5352math.OAmath.NT
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与代数数域相关的Toeplitz型C* 代数

C*-algebras of Toeplitz type associated with algebraic number fields

Joachim Cuntz, Christopher Deninger, Marcelo Laca

摘要:

我们将数域上的代数整数环$R$与一个C*-代数$\cT[R]$联系起来。它是环C*-代数$\cA[R]$的一个推广,以前研究的第一个命名的作者在合作X. Li。与$\cA[R]$相反,它在环的同态下是函子的。它也可以用$ax+b$ -半群$R\rtimes R^\times$在$\ell^2 (R\rtimes R^\times)$上的左正则表示来定义。代数$\cT[R]$带有自然的单参数自同构群$(σ_t)_{t\in\Rz}$。我们确定了它的KMS结构。我们遇到的技术困难是由于在$R$不是主理想域的情况下存在类群。在这种情况下,对于一个固定的大逆温度,KMS状态的单形在类群上分裂。“配分函数“是部分Dedekind $ζ$ -函数。我们证明了这样的部分$ζ$ -函数的渐近行为的一个结果,然后我们使用它来显示的唯一性的$β$-KMS状态的每个逆温度$β\in(1,2]$。

英文摘要:

We associate with the ring $R$ of algebraic integers in a number field a C*-algebra $\cT[R]$. It is an extension of the ring C*-algebra $\cA[R]$ studied previously by the first named author in collaboration with X.Li. In contrast to $\cA[R]$, it is functorial under homomorphisms of rings. It can also be defined using the left regular representation of the $ax+b$-semigroup $R\rtimes R^\times$ on $\ell^2 (R\rtimes R^\times)$. The algebra $\cT[R]$ carries a natural one-parameter automorphism group $(σ_t)_{t\in\Rz}$. We determine its KMS-structure. The technical difficulties that we encounter are due to the presence of the class group in the case where $R$ is not a principal ideal domain. In that case, for a fixed large inverse temperature, the simplex of KMS-states splits over the class group. The "partition functions" are partial Dedekind $ζ$-functions. We prove a result characterizing the asymptotic behavior of quotients of such partial $ζ$-functions, which we then use to show uniqueness of the $β$-KMS state for each inverse temperature $β\in(1,2]$.

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