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arXiv 1409.6352math.NT
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Apollonian填料的径向密度

Radial Density in Apollonian Packings

Jayadev S. Athreya, Cristian Cobeli, Alexandru Zaharescu

摘要:

给定阿波罗圆包装$\mathcal{P}$和$\mathcal{P}$中的圆$C_0 = \partial B(z_0, r_0)$,将$\mathcal{P}$中与$C_0$相切的圆盘集涂为红色。同心圆$C_ε = \partial B(z_0, r_0 + ε)$中红色的比例是多少,这个量作为$ε\rightarrow 0$的行为是什么?使用均匀分布的封闭的horocycles上的模块化表面$\mathbb{H}^2/SL(2, \mathbb{Z})$,我们表明,答案是$\frac{3}π = 0.9549\dots$。我们还描述了一个观察由于亚历克斯Kontorovich连接的速度,这种收敛的法利-福特包装的黎曼假设。对于Soddy Sphere填料的类似问题,我们发现极限径向密度为$\frac{\sqrt{3}}{2V_T}=0.853\dots$,其中$V_T$表示具有二面角的理想双曲四面体的体积$π/3$。

英文摘要:

Given an Apollonian Circle Packing $\mathcal{P}$ and a circle $C_0 = \partial B(z_0, r_0)$ in $\mathcal{P}$, color the set of disks in $\mathcal{P}$ tangent to $C_0$ red. What proportion of the concentric circle $C_ε = \partial B(z_0, r_0 + ε)$ is red, and what is the behavior of this quantity as $ε\rightarrow 0$? Using equidistribution of closed horocycles on the modular surface $\mathbb{H}^2/SL(2, \mathbb{Z})$, we show that the answer is $\frac{3}π = 0.9549\dots$ We also describe an observation due to Alex Kontorovich connecting the rate of this convergence in the Farey-Ford packing to the Riemann Hypothesis. For the analogous problem for Soddy Sphere packings, we find that the limiting radial density is $\frac{\sqrt{3}}{2V_T}=0.853\dots$, where $V_T$ denotes the volume of an ideal hyperbolic tetrahedron with dihedral angles $π/3$.

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