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arXiv 1805.04643math.DSmath.MGmath.PR
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随机自仿贝德福德-麦克马伦地毯的Assouad谱

The Assouad spectrum of random self-affine carpets

Jonathan M. Fraser, Sascha Troscheit

AI总结:

本文研究随机自仿贝德福德-麦克马伦地毯,推导其几乎必然Assouad谱和拟Assouad维数,发现非共形情形下它们通常不同于盒维数或Assouad维数,并给出示例说明差异。

摘要:

我们推导了随机自仿贝德福德-麦克马伦地毯的几乎必然Assouad谱和拟Assouad维数。先前的研究表明,(相关的)Assouad维数不足以区分随机模型中的细微变化,因为它几乎必然趋于“尽可能大”(一个确定性量)。这一现象已在共形和非共形两种情形下得到验证。在共形情形中,Assouad谱和拟Assouad维数的行为颇为不同,它们几乎必然与上盒维数一致。在此,我们研究非共形情形,发现Assouad谱和拟Assouad维数通常不与盒维数或Assouad维数一致。我们提供例子来突出这些概念之间的细微差别。我们的证明结合了确定性覆盖技术以及适当调整的Chernoff估计和Borel-Cantelli型论证。

英文摘要:

We derive the almost sure Assouad spectrum and quasi-Assouad dimension of random self-affine Bedford-McMullen carpets. Previous work has revealed that the (related) Assouad dimension is not sufficiently sensitive to distinguish between subtle changes in the random model, since it tends to be almost surely `as large as possible' (a deterministic quantity). This has been verified in conformal and non-conformal settings. In the conformal setting, the Assouad spectrum and quasi-Assouad dimension behave rather differently, tending to almost surely coincide with the upper box dimension. Here we investigate the non-conformal setting and find that the Assouad spectrum and quasi-Assouad dimension generally do not coincide with the box dimension or Assouad dimension. We provide examples highlighting the subtle differences between these notions. Our proofs combine deterministic covering techniques with suitably adapted Chernoff estimates and Borel-Cantelli type arguments.

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