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Condensed Matter > Soft Condensed Matter
Title: Order in disordered packings with and without permutation symmetry
(Submitted on 6 Mar 2024 (v1), last revised 23 Mar 2024 (this version, v2))
Abstract: A disordered solid, such as an athermal jammed packing of soft spheres, exists in a rugged potential-energy landscape in which there are a myriad of stable configurations that defy easy enumeration and characterization. Nevertheless, in three-dimensional monodisperse particle packings, we demonstrate an astonishing regularity in the distribution of basin volumes. The probability of landing randomly in a basin is proportional to its volume. Ordering the basins according to their probability, $P(n)$, from the largest at $n=1$ to smaller at larger $n$, we find approximately: $P(n) \propto n^{-1}$. This order, persisting up to the largest systems for which we can collect sufficient data, has implications for the dynamics of a system as it evolves under perturbations. In monodisperse packings there is ``permutation symmetry'' since identical particles can always be interchanged without affecting the system or its properties. Introducing any distribution of radii breaks this symmetry and leads to a proliferation of distinct configurations. We present an algorithm that partially restores permutation symmetry to such polydisperse packings.
Submission history
From: Varda F. Hagh [view email][v1] Wed, 6 Mar 2024 18:37:11 GMT (1324kb,D)
[v2] Sat, 23 Mar 2024 18:36:43 GMT (1619kb,D)
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