Abstract
We consider Gibbs distributions on permutations of a locally finite infinite set $X\subset\mathbb{R}$, where a permutation $\sigma $ of $X$ is assigned (formal) energy $\sum_{x\in X}V(\sigma (x)-x)$. This is motivated by Feynman’s path representation of the quantum Bose gas; the choice $X:=\mathbb{Z}$ and $V(x):=\alpha x^{2}$ is of principal interest. Under suitable regularity conditions on the set $X$ and the potential $V$, we establish existence and a full classification of the infinite-volume Gibbs measures for this problem, including a result on the number of infinite cycles of typical permutations. Unlike earlier results, our conclusions are not limited to small densities and/or high temperatures.
Citation
Marek Biskup. Thomas Richthammer. "Gibbs measures on permutations over one-dimensional discrete point sets." Ann. Appl. Probab. 25 (2) 898 - 929, April 2015. https://doi.org/10.1214/14-AAP1013
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