Logarithmic two-point correlators in the Abelian sandpile model

Details Logarithmic two-point correlators in the Abelian sandpile model Logarithmic two-point correlators in the Abelian sandpile model

2010-05-12

arxiv.org/abs/1005.2088v1

J.Stat.Mech.1007:P07025,2010

Physics

Condensed Matter

Statistical Mechanics

28 pages

Scientific paper

10.1088/1742-5468/2010/07/P07025

We present the detailed calculations of the asymptotics of two-site correlation functions for height variables in the two-dimensional Abelian sandpile model. By using combinatorial methods for the enumeration of spanning trees, we extend the well-known result for the correlation $\sigma_{1,1} \simeq 1/r^4$ of minimal heights $h_1=h_2=1$ to $\sigma_{1,h} = P_{1,h}-P_1P_h$ for height values $h=2,3,4$. These results confirm the dominant logarithmic behaviour $\sigma_{1,h} \simeq (c_h\log r + d_h)/r^4 + {\cal O}(r^{-5})$ for large $r$, predicted by logarithmic conformal field theory based on field identifications obtained previously. We obtain, from our lattice calculations, the explicit values for the coefficients $c_h$ and $d_h$ (the latter are new).

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