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When a dense monolayer of macroscopic slightly polydisperse spheres floats onchaotic capillary Faraday waves, a coexistence of large scale convective motionand caging dynamics typical for jammed systems is observed. We subtract theconvective mean flow using a coarse graining and reveal subdiffusion for thecaging time scales followed by a diffusive regime at later times. To test thesystem in the light of dynamic criticality, we apply the methods of dynamicheterogeneity to obtain the power-law divergent time and length scales as thefloater concentration approaches the jamming point. We find that these areindependent of the application of the coarse graining procedure. The criticalexponents are consistent with those found in dense suspensions of colloidsindicating universal stochastic dynamics.

Collective motion of macroscopic spheres floating on capillary ripples: Dynamic heterogeneity and dynamic criticality