Large time asymptotics of growth models on space-like paths I: PushASEP

TL;DR

This paper introduces a new particle system on a 1D lattice that interpolates between TASEP and Toom's model, analyzing its large-time fluctuations along space-like paths using Airy processes.

Contribution

It develops a novel interacting particle system bridging TASEP and Toom's model and characterizes its large-time fluctuation behavior with Airy processes.

Findings

Height fluctuations follow Airy_1 and Airy_2 processes.

Results apply to flat and step initial conditions.

Includes fluctuations of height profile and tagged particle trajectories.

Abstract

We consider a new interacting particle system on the one-dimensional lattice that interpolates between TASEP and Toom's model: A particle cannot jump to the right if the neighboring site is occupied, and when jumping to the left it simply pushes all the neighbors that block its way. We prove that for flat and step initial conditions, the large time fluctuations of the height function of the associated growth model along any space-like path are described by the Airy_1 and Airy_2 processes. This includes fluctuations of the height profile for a fixed time and fluctuations of a tagged particle's trajectory as special cases.