paper

3D loop models and the CP^{n-1} sigma model

arXiv:1104.4096 · doi:10.1103/PhysRevLett.107.110601

Abstract

Many statistical mechanics problems can be framed in terms of random curves; we consider a class of three-dimensional loop models that are prototypes for such ensembles. The models show transitions between phases with infinite loops and short-loop phases. We map them to sigma models, where is the loop fugacity. Using Monte Carlo simulations, we find continuous transitions for , and first order transitions for . The results are relevant to line defects in random media, as well as to Anderson localization and -dimensional quantum magnets.

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