The critical one-half conjecture for bounded-aspect-ratio ellipse packings

Let M1M\geq1, and let S\mathcal{S} be a packing of closed elliptical disks whose aspect ratios are at most MM. Let s0Ss_0\in\mathcal{S}. Ellipse-packing critical and exponential-decay conjecture. There exists a function f:(0,1/2)×[1,)(0,)f:(0,1/2)\times[1,\infty)\to(0,\infty) such that

P(ES,1/2(s0,))=0.\mathbb{P}(E_{\mathcal{S},1/2}(s_0,\infty))=0.

If additionally D:=supsSdiam(s)<D:=\sup_{s\in\mathcal{S}}\operatorname{diam}(s)<\infty, then for every 0<p<1/20<p<1/2 and r>0r>0,

P(ES,p(s0,r))exp(f(p,M)rD).\mathbb{P}(E_{\mathcal{S},p}(s_0,r))\leq\exp\left(-f(p,M)\frac{r}{D}\right).

This extends the proposed circle-packing statements to planar ellipse packings, with the decay rate allowed to depend on the aspect-ratio bound. The source does not state a resolution.

Sources & referencesView supporting material

Primary source

Ron Peled, “On the site percolation threshold of circle packings and planar graphs”, arXiv:2001.10855 (2020).

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