Local density conjecture for domino tilings

From papers

Let pap_a, pbp_b, pcp_c, and pdp_d be the edge-density quantities associated with the dimer model on an n×nn\times n torus in the thermodynamic limit. Consider an infinite sequence of enlarging planar regions whose normalized boundary height functions converge to a fixed boundary asymptotic height function, and mesoscopic subregions staying away from the boundary. At points where the entropy-maximizing height function has defined partial derivatives, let

(s,t)=(fx,fy)(s,t)=\left(\frac{\partial f}{\partial x},\frac{\partial f}{\partial y}\right)

be the tilt, with s+t<2|s|+|t|<2. Local density conjecture. In the thermodynamic limit, the probability of seeing a domino in a particular location is given by the suitable member of the 44-tuple (pa,pb,pc,pd)(p_a,p_b,p_c,p_d). Equivalently, the local densities of aa-, bb-, cc-, and dd-edges are pap_a, pbp_b, pcp_c, and pdp_d, respectively. This conjecture proposes that the torus quantities pa,pb,pc,pdp_a,p_b,p_c,p_d describe local domino probabilities in planar regions wherever the limiting height function is smooth and the tilt is non-extremal. The source provides no resolution, so the conjecture remains open.

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Sources & referencesView supporting material

Primary source

Henry Cohn, Richard Kenyon and James Propp, “A variational principle for domino tilings”, arXiv:math/0008220 (2001).

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