Approach to Hyperuniformity of Steady States of Facilitated Exchange Processes

2024/01/29 by Goldstein, S., Lebowitz, J. L., Speer, E. R. · 1 citation
#FOS: Physical sciences #Statistical Mechanics (cond-mat.stat-mech)

paper · doi:10.48550/arxiv.2401.16505

Abstract

We consider the fluctuations in the number of particles in a box of size L^d in Z^d, d>=1, in the (infinite volume) translation invariant stationary states of the facilitated exclusion process, also called the conserved lattice gas model. When started in a Bernoulli (product) measure at density rho, these systems approach, as t goes to infinity, a "frozen" state for rho<=rho_c, with rho_c=1/2 for d=1 and rho_c<1/2 for d>=2. At rho=rho_c the limiting state is hyperuniform, that is, the variance of the number of particles in the box grows slower than L^d. We give a general description of how the variances at different scales of L behave as rho increases to rho_c. On the largest scale, L>>L₂, the fluctuations are normal (in fact the same as in the original product measure), while in a region L₁<=2.)

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