Suppressed Compressibility at Large Scale in Jammed Packings of Size-Disperse Spheres Auteur(s): Berthier L., Chaudhuri Pinaki, Coulais Corentin, Dauchot Olivier, Sollich Peter (Article) Publié: Physical Review Letters, vol. 106 p.120601 (2011) Texte intégral en Openaccess : Ref HAL: hal-00597228_v1 PMID 21517290 Ref Arxiv: 1008.2899 DOI: 10.1103/PhysRevLett.106.120601 WoS: 000288599300002 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 70 Citations Résumé: We analyze the large scale structure and fluctuations of jammed packings of polydisperse spheres produced both numerically and in a granular experiment. While the structure factors of the packings reveal no unusual behavior for small wavevectors, the compressibility displays an anomalous linear dependence at low wavectors and vanishes when q -> 0. Our results apply to arbitrary particle size distributions. For continuous distributions, we derive simple perturbative approximations for the compressibility that are accurate for polydispersity up to about 30%. We show that the compressibility vanishes because jammed packings of polydisperse spheres have no bulk fluctuations of the volume fraction and are thus hyperuniform, a property not observed experimentally before. Commentaires: 4 pages; 2 figures |