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arXiv 1010.0156math.OA
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谱三元组与非周期序

Spectral triples and aperiodic order

J. Kellendonk, J. Savinien

摘要:

我们构造了紧度量空间(X,d)的谱三元组.这为我们提供了X上的一个新的度量d_s。我们研究了它与原度量d的关系。当X是子移位空间或离散的平铺空间,且d满足一定的界时,我们认为d_s与d的Lipschitz等价性是高阶的一个刻画。对于episturmian子移位,我们证明了d_s与d是Lipschitz等价的当且仅当子移位是排斥的(或幂自由的).对于Sturmian子移位,这等价于线性递归。对于重复的平铺,我们表明,如果他们的补丁具有等分布的频率,那么这两个度量是Lipschitz等价的。此外,我们研究了谱三元组的zeta函数,并将其收敛横坐标与子移位或平铺的复杂性指数联系起来。最后,我们推导出拉普拉斯算子的谱三元组和比较我们的建设与皮尔逊和Bellissard。

英文摘要:

We construct spectral triples for compact metric spaces (X, d). This provides us with a new metric d_s on X. We study its relation with the original metric d. When X is a subshift space, or a discrete tiling space, and d satisfies certain bounds we advocate that the property of d_s and d to be Lipschitz equivalent is a characterization of high order. For episturmian subshifts, we prove that d_s and d are Lipschitz equivalent if and only if the subshift is repulsive (or power free). For Sturmian subshifts this is equivalent to linear recurrence. For repetitive tilings we show that if their patches have equi-distributed frequencies then the two metrics are Lipschitz equivalent. Moreover, we study the zeta-function of the spectral triple and relate its abscissa of convergence to the complexity exponent of the subshift or the tiling. Finally, we derive Laplace operators from the spectral triples and compare our construction with that of Pearson and Bellissard.

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