2010/08/31 by Ludovic Berthier, Pinaki Chaudhuri, Corentin Coulais +2 · 102 citations
Chemical Engineering · Engineering · Materials Science · Physics and Astronomy · #Composite Material Mechanics #Compressibility #Material Dynamics and Properties #Materials science #Mechanics #Physics #Rheology and Fluid Dynamics Studies #SPHERES #Scale (ratio) #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevlett.106.120601
published in Physical Review Letters 106(12), 120601 (American Physical Society) · 4 pages; 2 figures; v2=published version
openalex publication_date 2011/03/21 · arxiv created 2011/05/31 · arxiv updated 2011/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyze the large-scale structure and fluctuations of jammed packings of size-disperse spheres, produced in a granular experiment as well as numerically. While the structure factor of the packings reveals no unusual behavior for small wave vectors, the compressibility displays an anomalous linear dependence at low wave vectors and vanishes when q→0. We show that such behavior occurs because jammed packings of size-disperse spheres have no bulk fluctuations of the volume fraction and are thus hyperuniform, a property not observed experimentally before. Our results apply to arbitrary particle size distributions. For continuous distributions, we derive a perturbative expression for the compressibility that is accurate for polydispersity up to about 30%.