Percolation conjecture for a single current above the Ising critical point

Let βc\beta_c be the critical inverse temperature, and let PZ2,β{\bf P}_{\mathbb Z^2,\beta}^{\emptyset} denote the infinite-volume sourceless random-current measure on Z2\mathbb Z^2. Write 0 in n^0\xleftrightarrow{}\infty\text{ in }\widehat{\mathbf n} for the event that the origin is connected to infinity in the current configuration n^\widehat{\mathbf n}. Single-current percolation conjecture. For β>βc\beta>\beta_c, one has

PZ2,β[0 in n^]>0.{\bf P}_{\mathbb Z^2,\beta}^{\emptyset}[0\xleftrightarrow{}\infty\text{ in }\widehat{\mathbf n}]>0.

The conjecture would strengthen the known supercritical behavior for the sum of two independent currents: βc\beta_c is the phase transition for percolation of n1+n2\mathbf n_1+\mathbf n_2, whereas the corresponding statement for a single current remains open. It is motivated by the possibility that above βc\beta_c, current loops unfold into infinite loops.

Sources & referencesView supporting material

Primary source

Michael Aizenman, Hugo Duminil-Copin, Vincent Tassion and Simone Warzel, “Emergent Planarity in two-dimensional Ising Models with finite-range Interactions”, arXiv:1801.04960 (2018).

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