The critical one-half conjecture for circle packings

Let 4S44\mathcal{S}4 be a circle packing and let s0Ss_0\in\mathcal{S}. For 0<p<10<p<1, let ES,p(s0,r)E_{\mathcal{S},p}(s_0,r) denote the event that s0s_0 is connected to distance rr by open disks, and let ES,p(s0,)E_{\mathcal{S},p}(s_0,\infty) denote the event that it is connected to infinity. The critical one-half conjecture for circle packings.

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

This would imply absence of infinite components at p=1/2p=1/2 for several classes of planar graphs, including recurrent simple plane triangulations and suitable Benjamini–Schramm limits. It remains open even for triangulation circle packings with carrier R2\mathbb{R}^2 and uniformly bounded disk radii.

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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