Thermodynamic Limit for the Mallows Model on $S_n$

The Mallows model on $S_n$ is a probability distribution on permutations, $q^{d(\pi ,e)}\mathrm{/}{P}_n(q)$, where $d(\pi ,e)$ is the distance between $\pi$ and the identity element, relative to the Coxeter generators. Equivalently, it is the number of inversions: pairs $(i,j)$ where $1\le i<j\le n$, but ${\pi }_i>{\pi }_j$. Analyzing the normalization $P_n(q)$, Diaconis and Ram calculated the mean and variance of $d(\pi ,e)$ in the Mallows model, which suggests the appropriate $n \to \infty$limithas$q_n$scalingas$1-\beta/n$. We calculate the distribution of the empirical measure in this limit, $u(x,y) dx dy = \lim_{n \to \infty} \frac{1}{n} \sum_{i=1}^{n} \delta_{(i,\pi_i)}$. Treating it as a mean-field problem, analogous to the Curie-Weiss model, the self-consistent mean-field equations are $\frac{\partial^2}{\partial x \partial y} \ln u(x,y) = 2 \beta u(x,y)$, which is an integrable PDE, known as the hyperbolic Liouville equation. The explicit solution also gives a new proof of formulas for the blocking measures in the weakly asymmetric exclusion process, and the ground state of the ${\mathcal{U}}_q({\mathfrak{s}\mathfrak{l}}_2)$-symmetric XXZ ferromagnet.