Caging dynamics in a granular fluid

Details Caging dynamics in a granular fluid Caging dynamics in a granular fluid

2006-10-17

arxiv.org/abs/cond-mat/0610489v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.188301

We report an experimental investigation of the caging motion in a uniformly heated granular fluid, for a wide range of filling fractions, $\phi$. At low $\phi$ the classic diffusive behavior of a fluid is observed. However, as $\phi$ is increased, temporary cages develop and particles become increasingly trapped by their neighbors. We statistically analyze particle trajectories and observe a number of robust features typically associated with dense molecular liquids and colloids. Even though our monodisperse and quasi-2D system is known to not exhibit a glass transition, we still observe many of the precursors usually associated with glassy dynamics. We speculate that this is due to a process of structural arrest provided, in our case, by the presence of crystallization.

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