The building blocks of dynamical heterogeneities in dense granular media

Abstract

We investigate experimentally the connection between short time dynamics and long time dynamical heterogeneities within a dense granular media under cyclic shear. We show that dynamical heterogeneities result from a two timescales process. Short time but already collective events consisting in clustered cage jumps concentrate most of the non affine displacements. On larger timescales such clusters appear aggregated both temporally and spatially in avalanches which eventually build the large scales dynamical heterogeneities. Our results indicate that facilitation plays an important role in the relaxation process although it does not appear to be conserved as proposed in many models studied in the literature.

4 pages, 4 figures

References in corpus (7)

• Glassy dynamics of kinetically constrained models
• Irreversible reorganization in a supercooled liquid originates from localised soft modes
• Inhomogeneous Mode-Coupling Theory and Growing Dynamic Length in Supercooled Liquids
• Critical scaling and heterogeneous superdiffusion across the jamming/rigidity transition of a granular glass
• Approach to jamming in an air-fluidized granular bed
• Heterogeneous Dynamics, Marginal Stability and Soft Modes in Hard Sphere Glasses
• Lower bound on the four-point dynamical susceptibility: Direct experimental test on a granular packing

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