Details

Autor(en) / Beteiligte

• Coulais, C
• Behringer, R P
• Dauchot, O

Titel

Dynamics of the contacts reveals Widom lines for jamming

Ist Teil von

• Europhysics letters, 2012-11, Vol.100 (4), p.1-1

Ort / Verlag

Les Ulis: IOP Publishing

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The authors experimentally study the vicinity of the jamming transition by investigating the statics and the dynamics of the contact network of a horizontally shaken bi-disperse packing of photo-elastic discs. Compressing the packing very slowly, while maintaining a mechanical excitation, yields a granular glass, namely a frozen structure of vibrating grains. In this glass phase, they observe a remarkable dynamics of the contact network, which exhibits strong dynamical heterogeneities. Such heterogeneities are maximum at a packing fraction ... , distinct and smaller than the structural packing fraction ... , which is indicated by an abrupt variation of the average number of contacts per particle. The authors demonstrate that the two crossovers, one for the maximum dynamical heterogeneity, and the other for static jamming, converge at point J in the zero mechanical-excitation limit, a behavior reminiscent of the Widom lines in the supercritical phase of a second-order critical point. (ProQuest: ... denotes formulae/symbols omitted.)