Statistics of Conserved Quantities in Mechanically Stable Packings of Frictionless Disks Above Jamming

Original · EN

We numerically simulate mechanically stable packings of soft-core, frictionless, bidisperse disks in two dimensions, above the jamming packing fraction ϕⱼ. For configurations with a fixed isotropic global stress tensor, we compute the averages, variances, and correlations of conserved quantities (stress Γ C, force-tile area A C, Voronoi volume V C, number of particles N C, and number of small particles Ns C) on compact subclusters of particles C, as a function of the cluster size and the global system stress. We find several significant differences depending on whether the cluster C is defined by a fixed radius R or a fixed number of particles M. We comment on the implications of our findings for maximum entropy models of jammed packings.