Passage-time moments and hybrid zones for the exclusion-voter model

TL;DR

This paper investigates the dynamics of a one-dimensional particle system combining voter and exclusion models, analyzing relaxation times, moments, and asymptotics, providing new non-existence results and insights into hybrid zones.

Contribution

It provides the first non-existence-of-moments results for the relaxation time in the mixture of voter and exclusion models, extending understanding of their non-equilibrium behavior.

Findings

Conditions for finiteness of relaxation time τ

Almost sure asymptotics for hybrid zone size

Non-existence of certain moments of τ

Abstract

We study the non-equilibrium dynamics of a one-dimensional interacting particle system that is a mixture of the voter model and the exclusion process. With the process started from a finite perturbation of the ground state Heaviside configuration consisting of 1's to the left of the origin and 0's elsewhere, we study the relaxation time $\tau$, that is, the first hitting time of the ground state configuration (up to translation). We give conditions for $\tau$ to be finite and for certain moments of $\tau$ to be finite or infinite, and prove a result that approaches a conjecture of Belitsky et al. (Bernoulli 7 (2001) 119--144). Ours are the first non-existence-of-moments results for $\tau$ for the mixture model. Moreover, we give almost sure asymptotics for the evolution of the size of the hybrid (disordered) region. Most of our results pertain to the discrete-time setting, but several transfer to continuous-time. As well as the mixture process, some of our results also cover pure exclusion. We state several significant open problems.