Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.16: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Continuous and discontinuous jamming transitions — •Claus Heussinger and Jean-Louis Barrat — Laboratoire de Physique de la Matière Condensée et Nanostructures Université Lyon 1

We discuss the jamming transition of frictionless elastic particles at zero temperature. A quasistatic shear simulation is implemented that probes the yield-stress of the system. By varying the volume-fraction across the jamming point we cannot only follow the yield-stress line but also discuss the flow properties of the fluid below jamming.

Previous studies have viewed jamming as a mixed continuous-discontinuous phase transition, as it has both a diverging correlation length and a discontinuous order parameter (number of particle contacts).

In contrast, our results suggest that the number of contacts is fully continuous across the transition and only shows a cusp singularity. Furthermore, we will discuss the mean-square displacement as well as four-point correlation functions to highlight the role of dynamical effects in the process of jamming.