Edwards-Wilkinson fluctuations in the Howitt-Warren flows

Abstract

We study current fluctuations in a one-dimensional interacting particle system known as the dual smoothing process that is dual to random motions in a Howitt-Warren flow. The Howitt-Warren flow can be regarded as the transition kernels of a random motion in a continuous space-time random environment. It turns out that the current fluctuations of the dual smoothing process fall in the Edwards-Wilkinson universality class, where the fluctuations occur on the scale $t^{1/4}$ and the limit is a universal Gaussian process. Along the way, we prove a quenched invariance principle for a random motion in the Howitt-Warren flow. Meanwhile, the centered quenched mean process of the random motion also converges on the scale $t^{1/4}$, where the limit is another universal Gaussian process.

32 pages, typos corrected, to appear in Stochastic Processes and their Applications. arXiv admin note: text overlap with arXiv:1011.3895 by other authors

References in corpus (4)

• Flows, coalescence and noise
• The Brownian web: Characterization and convergence
• An almost sure invariance principle for random walks in a space-time random environment
• Hammersley's harness process: invariant distributions and height fluctuations