康托尔集与奇维球面乘积的极小动力系统的C* 代数
C*-algebras of minimal dynamical systems of the product of a Cantor set and an odd dimensional sphere
摘要:
设β:S^\to S^n,其中n = 2k + 1,k \geq 1,是奇维球面的非唯一遍历极小自同态的已知例子之一.对于每一个这样的极小动力系统(S^n,β),存在一个Cantor极小系统(X,α),使得相应的乘积系统(X x S^n,αx β)是极小的,并且由此得到的交叉积C*-代数C(X x S^n)\rtimes_{αx β} \mathbb{Z}是迹逼近区间代数(TAI).这就需要对这样的C* 代数进行分类。此外,极小Cantor系统(X,α)使得C(X x S^n)\rtimes_β \mathbb{Z}上的每个迹态诱导K_0-群上的相同态,并且使得C(S^n)\rtimes_β \mathbb{Z}嵌入C(X x S^n)\rtimes_{αx β} \mathbb{Z}保持迹态空间.这意味着C(S^n)\rtimes_β \mathbb{Z}在用泛UHF代数张量后是TAI,这反过来表明这些奇维球面的极小同态的例子的C* 代数-代数是由它们的迹状态空间分类的。
英文摘要:
Let β: S^n \to S^n, for n = 2k + 1, k \geq 1, be one of the known examples of a non-uniquely ergodic minimal diffeomorphism of an odd dimensional sphere. For every such minimal dynamical system (S^n, β) there is a Cantor minimal system (X, α) such that the corresponding product system (X x S^n, αx β) is minimal and the resulting crossed product C*-algebra C(X x S^n) \rtimes_{αx β} \mathbb{Z} is tracially approximately an interval algebra (TAI). This entails classification for such C*-algebras. Moreover, the minimal Cantor system (X, α) is such that each tracial state on C(X x S^n) \rtimes_β \mathbb{Z} induces the same state on the K_0-group and such that the embedding of C(S^n) \rtimes_β \mathbb{Z} into C(X x S^n) \rtimes_{αx β} \mathbb{Z} preserves the tracial state space. This implies C(S^n) \rtimes_β \mathbb{Z} is TAI after tensoring with the universal UHF algebra, which in turn shows that the C*-algebras of these examples of minimal diffeomorphisms of odd dimensional spheres are classified by their tracial state spaces.
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