Percolation and circle-packing modulus conjecture for periodic triangulations

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Let T∗T^* be a triangulation of the torus, and let T^∗\hat T^* be its universal cover. For α∈H\alpha\in\mathbb{H}, write T^α∗\hat T^*_{\alpha} for the corresponding realization in the conformal modulus α\alpha. Percolation modulus conjecture. The critical parameter for site-percolation on T^∗\hat T^* is 1/21/2, and for every α∈H\alpha\in\mathbb{H}, critical site-percolation on T^α∗\hat T^*_{\alpha} has a scaling limit. Moreover, the modulus at which the model is conformally invariant in the scaling limit is the modulus obtained from the circle packing associated to T^∗\hat T^*:

αTPerc=αTCP.\alpha_T^{\mathrm{Perc}}=\alpha_T^{\mathrm{CP}}.

This conjecture proposes a universality principle for critical site-percolation on periodic triangulations and identifies its conformally invariant embedding with the circle-packing embedding. The source explicitly describes it as closer to wishful thinking, and gives no resolution.

References

Primary source

Vincent Beffara, “Is critical 2D percolation universal?”, arXiv:0708.3908 (2007).

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