Quantification of ergodicity for Hamilton--Jacobi equations in a dynamic random environment

Abstract

We study quantitative large-time averages for Hamilton--Jacobi equations in a dynamic random environment that is stationary ergodic and has unit-range dependence in time. Our motivation comes from stochastic growth models related to the tensionless (inviscid) KPZ equation, which can be formulated as a Hamilton--Jacobi equation with random forcing. Understanding the large-time averaged behavior of solutions is closely connected to fundamental questions about fluctuations and scaling in such growth processes.