Long-time tails and cage effect in driven granular fluids

Details Long-time tails and cage effect in driven granular fluids Long-time tails and cage effect in driven granular fluids

2008-09-25

arxiv.org/abs/0809.4432v2

Phys. Rev. Lett. 102, 098001 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.098001

We study the velocity autocorrelation function (VACF) of a driven granular fluid in the stationary state in 3 dimensions. As the critical volume fraction of the glass transition in the corresponding elastic system is approached, we observe pronounced cage effects in the VACF as well as a strong decrease of the diffusion constant. At moderate densities the VACF is shown to decay algebraically in time (t^{-3/2}) like in a molecular fluid, as long as the driving conserves momentum locally.

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