The building blocks of dynamical heterogeneities in dense granular media

Details The building blocks of dynamical heterogeneities in dense granular media The building blocks of dynamical heterogeneities in dense granular media

2008-11-03

arxiv.org/abs/0811.0201v2

Phys. Rev. Lett. (102) 088001 (2009)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.088001

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.

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