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arXiv 2007.07661math.DS
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Logistic族中朱利亚集的豪斯多夫维数

Hausdorff dimension of Julia sets in the logistic family

Neil Dobbs, Jacek Graczyk, Nicolae Mihalache

摘要:

闭区间和圆是多项式动力学中唯一的光滑朱利亚集。D. Ruelle证明了靠近圆的单临界朱利亚集的豪斯多夫维数解析地依赖于参数。在Mandelbrot集M的尖端附近,豪斯多夫维数通常是不连续的。问一个关于J-C的问题。Yoccoz在共形环境下,我们观察到二次朱利亚集的豪斯多夫维数连续依赖于$c$,并在一维勒贝格测度意义下,找到了大多数实参数在M尖端的显式界.

英文摘要:

A closed interval and circle are the only smooth Julia sets in polynomial dynamics. D. Ruelle proved that the Hausdorff dimension of unicritical Julia sets close to the circle depends analytically on the parameter. Near the tip of the Mandelbrot set M, the Hausdorff dimension is generally discontinuous. Answering a question of J-C. Yoccoz in the conformal setting, we observe that the Hausdorff dimension of quadratic Julia sets depends continuously on $c$ and find explicit bounds at the tip of M for most real parameters in the the sense of 1-dimensional Lebesgue measure.

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