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Phys Rev Lett. 2002 Aug 19;89(8):084301. Epub 2002 Aug 2.

Forcing and velocity correlations in a vibrated granular monolayer.

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Department of Physics, Georgetown University, Washington, D.C., 20057, USA.


The role of forcing on the dynamics of a vertically shaken granular monolayer is investigated. Using a flat plate, surprising negative velocity correlations are measured. A mechanism for this anticorrelation is proposed with support from both experimental results and molecular dynamics simulations. Using a rough plate, velocity correlations are positive, and the velocity distribution evolves from a Gaussian at very low densities to a broader distribution at high densities. These results are interpreted as a balance between stochastic forcing, interparticle collisions, and friction with the plate.

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