2004/03/29 by Apoorva Nagar, Mustansir Barma, Satya N. Majumdar
Physics and Astronomy · #cond-mat.stat-mech
published as Proceedings of National Conference on Nonlinear Systems and Devices, pages 85-88,(2003) · 4 pages, 3 figures
arxiv created 2004/03/29 · arxiv updated 2009/12/01
We study the clustering properties of advected, non-interacting,passive scalar particles in a Burgers fluid with noise, a problem which maps to that of passive sliding particles moving under gravity on a surface evolving through the Kardar-Parisi-Zhang equation. Numerical simulations show that both the density-density correlation function and the single-site mass distribution scale with system size. The scaling functions diverge at small argument, indicating strong clustering of particles. We analytically evaluate the scaling functions for the two-point correlation and mass distribution of noninteracting particles in thermal equilibrium in a random landscape, and find that the results are remarkably similar to those for nonequilibrium advection.