Ground-state structure and dynamics in a toy model for granular compaction

摘要

We report on a toy model for the glassy compaction dynamics of granular systems, introduced and investigated in collaboration with Anita Mehta and Peter Stadler. A stochastic dynamics is defined on a column of grains. Grains are anisotropic and possess a discrete orientational degree of freedom. Gravity induces long-range directional interactions down the column. The key control parameter of the model, epsilon, is a representation of granular shape. Rational and irrational values of e correspond to very different kinds of behavior, both in statics (structure of ground states) and in low-temperature dynamics (retrieval of ground states). (c) 2006 Elsevier B.V. All rights reserved.