Random-current phase transition conjecture on the hexagonal lattice

Let H\mathbb{H} be the hexagonal lattice. Denote by PH\mathbf{P}_{\mathbb{H}} the single random-current measure and by ϕH\phi_{\mathbb{H}} the associated random-cluster model.

Hexagonal-lattice random-current conjecture. All phase transitions of the random current and random-cluster model on the hexagonal lattice coincide:

βcperc(PH)=βc(ϕH).\beta_c^{\operatorname{perc}}(\mathbf{P}_{\mathbb{H}})=\beta_c(\phi_{\mathbb{H}}).

The loop O(1)\mathrm{O}(1) model has an explicitly understood phase diagram on the hexagonal lattice, whereas the random-current measure is expected to exhibit a more generic behaviour. The conjectured equality remains open in the source.

Sources & referencesView supporting material

Primary source

Ulrik Thinggaard Hansen, Boris Kjær and Frederik Ravn Klausen, “The Uniform Even Subgraph and Its Connection to Phase Transitions of Graphical Representations of the Ising Model”, arXiv:2306.05130 (2025).

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