Condensation in perturbed zero-range processes

Details Condensation in perturbed zero-range processes Condensation in perturbed zero-range processes

2012-01-05

arxiv.org/abs/1201.1264v1

Physics

Condensed Matter

Statistical Mechanics

18 pages, 6 figures

Scientific paper

The zero-range process is a stochastic interacting particle system that exhibits a condensation transition under certain conditions on the dynamics. It has recently been found that a small perturbation of a generic class of jump rates leads to a drastic change of the phase diagram and prevents condensation in an extended parameter range. We complement this study with rigorous results on a finite critical density and quenched free energy in the thermodynamic limit, as well as quantitative heuristic results for small and large noise which are supported by detailed simulation data. While our new results support the initial findings, they also shed new light on the actual (limited) relevance in large finite systems, which we discuss via fundamental diagrams obtained from exact numerics for finite systems.

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