Penrose双曲镶嵌的C* 代数-代数
C*-algebras of Penrose's hyperbolic tilings
摘要:
彭罗斯双曲镶嵌是双曲平面的镶嵌,直到仿射变换,它允许有限数量的原体。本文给出了C* 代数的一个完整的描述,并给出了这类镶嵌的K-理论。由于这些平铺的连续壳没有横截不变测度,因此这些C* 代数是无迹的。然而,谐波电流引起3循环上循环,我们讨论在这种设置的高阶版本的间隙标签。
英文摘要:
Penrose hyperbolic tilings are tilings of the hyperbolic plane which admit, up to affine transformations a finite number of prototiles. In this paper, we give a complete description of the C*-algebras and of the K-theory for such tilings. Since the continuous hull of these tilings have no transversally invariant measure, these C*-algebras are traceless. Nevertheless, harmonic currents give rise to 3-cyclic cocycles and we discuss in this setting a higher-order version of the gap-labelling.
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