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2014 Tricolor percolation and random paths in 3D
Scott Sheffield, Ariel Yadin
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Electron. J. Probab. 19: 1-23 (2014). DOI: 10.1214/EJP.v19-3073


We study "tricolor percolation" on the regular tessellation of $\mathbb{R}^3$ by truncated octahedra, which is the three-dimensional analog of the hexagonal tiling of the plane. We independently assign one of three colors to each cell according to a probability vector $p = (p_1, p_2, p_3)$ and define a "tricolor edge" to be an edge incident to one cell of each color. The tricolor edges form disjoint loops and/or infinite paths. These loops and paths have been studied in the physics literature, but little has been proved mathematically.

We show that each $p$ belongs to either the compact phase (in which the length of the tricolor loop passing through a fixed edge is a.s. finite, with exponentially decaying law) or the extended phase (in which the probability that an $(n \times n \times n)$ box intersects a tricolor path of diameter at least $n$ exceeds a positive constant, independent of $n$). We show that both phases are non-empty and the extended phase is a closed subset of the probability simplex.

We also survey the physics literature and discuss open questions, including the following: Does $p=(1/3,1/3,1/3)$ belong to the extended phase? Is there a.s. an infinite tricolor path for this $p$? Are there infinitely many? Do they scale to Brownian motion? If $p$ lies on the boundary of the extended phase, do the long paths have a scaling limit analogous to SLE6 in two dimensions? What can be shown for the higher dimensional analogs of this problem?


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Scott Sheffield. Ariel Yadin. "Tricolor percolation and random paths in 3D." Electron. J. Probab. 19 1 - 23, 2014.


Accepted: 6 January 2014; Published: 2014
First available in Project Euclid: 4 June 2016

zbMATH: 1307.60147
MathSciNet: MR3164757
Digital Object Identifier: 10.1214/EJP.v19-3073

Primary: 60K35
Secondary: 82B43

Keywords: body centered cubic lattice , permutahedron , tricolor percolation , truncated octahedron , vortex models


Vol.19 • 2014
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