Lattice gas with a liquid-gas transition

Abstract

We discuss a new momentum-conserving lattice-gas model in which particles are allowed to exchange momentum between distant sites. The interactions may be tuned so that a first-order transition occurs between a dense and a light phase. An equation of state may be predicted with the assumption that the lattice is in a factorized state just after the particles have propagated. This method accurately predicts the pressure of the stable and unstable states.