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arXiv 2108.01762math.DS
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紧字母表上置换的谱性质

Spectral properties of substitutions on compact alphabets

Neil Mañibo, Dan Rust, James J. Walton

摘要:

考虑了紧字母表上的置换,给出了衍射为纯点、绝对连续和奇异连续的充分条件。这使得人们可以构造这样的例子,即在相关的函数空间上的库普曼算子具有特定的谱分量。对于阿贝尔双射替换,我们提供了一个关于衍射光谱类型的二分法结果。我们还提供了第一个例子的替代,具有可数无限勒贝格谱分量和可数无限奇异连续分量。最后,我们给出了一个非常长的替代可数无限字母表,产生替代Delone集的无限型。这推广了有限字母表和具有膨胀对称性的有限型Delone集上的置换谱理论。

英文摘要:

We consider substitutions on compact alphabets and provide sufficient conditions for the diffraction to be pure point, absolutely continuous and singular continuous. This allows one to construct examples for which the Koopman operator on the associated function space has specific spectral components. For abelian bijective substitutions, we provide a dichotomy result regarding the spectral type of the diffraction. We also provide the first example of a substitution that has countably infinite Lebesgue spectral components and countably infinite singular continuous components. Lastly, we give a non-constant length substitution on a countably infinite alphabet that gives rise to substitutive Delone sets of infinite type. This extends the spectral theory of substitutions on finite alphabets and Delone sets of finite type with inflation symmetry.

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