The simultaneous-crossing independence conjecture for the 4-state Potts model

Take a polygon Ω\Omega whose boundary is composed of edges of a hexagonal lattice of mesh hh, and let A1,A2,A3,A4,A5,A6A_1,A_2,A_3,A_4,A_5,A_6 be boundary vertices. Assign each hexagon one of four colors independently with probability 1/41/4. Define E1E_1 as the event that A1A2A_1A_2 and A4A5A_4A_5 are joined by a path of hexagons colored 11 or 44, E2E_2 as the analogous event for A2A3A_2A_3 and A5A6A_5A_6 using colors 22 or 44, and E3E_3 as the analogous event for A3A4A_3A_4 and A6A1A_6A_1 using colors 33 or 44. Simultaneous-crossing independence conjecture. As h0h\to0 and (Ω,A1,A2,A3,A4,A5,A6)(\Omega,A_1,A_2,A_3,A_4,A_5,A_6) approaches a planar domain with rectifiable Jordan boundary and six distinct boundary points in the Carathéodory sense, the events become mutually independent; equivalently,

P(E1E2E3)P(E1)P(E2)P(E3)0.P(E_1\cap E_2\cap E_3)-P(E_1)P(E_2)P(E_3)\to0.

The conjecture proposes a conformally stable independence phenomenon for the simplest 4-state Potts-model event that does not reduce to two-state events. No proof or disproof is given in the supplied text.

Sources & referencesView supporting material

Primary source

Mikhail Skopenkov, “Lattice gauge theory and a random-medium Ising model”, arXiv:2012.02591 (2020).

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