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arXiv 2301.04519math.DS
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关于二次多项式朱利亚集的豪斯多夫维数在-2处的方向导数

On the directional derivative of the Hausdorff dimension of quadratic polynomial Julia sets at -2

Ludwik Jaksztas

摘要:

令$d(δ)$表示多项式$f_δ(z)=z^2-2+δ$的Julia集的豪斯多夫维数。在本文中,我们将研究的方向导数的功能$d$沿方向降落在参数$0$,这对应于$-2$的情况下,家庭$p_c(z)=z^2+c$。我们将考虑所有的方向,除了一个$δ\in\mathbb{R}^+$,它是在曼德尔布罗特集。我们将证明PDMATHAMO的方向导数的渐近公式。此外,我们将看到,在封闭的左半平面中,导数对所有方向都是负的。计算机计算表明,除了在$\mathbb{R}^+$周围有一个圆锥(开角约为$74^\circ$)外,它都是负的。

英文摘要:

Let $d(δ)$ denote the Hausdorff dimension of the Julia set of the polynomial $f_δ(z)=z^2-2+δ$. In this paper we will study the directional derivative of the function $d$ along directions landing at the parameter $0$, which corresponds to $-2$ in the case of family $p_c(z)=z^2+c$. We will consider all directions, except the one $δ\in\mathbb{R}^+$, which is inside the Mandelbrot set. We will prove asymptotic formula for the directional derivative of $d$. Moreover, we will see that the derivative is negative for all directions in the closed left half-plane. Computer calculations show that it is negative except a cone (with opening angle approximately $74^\circ$) around $\mathbb{R}^+$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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