Noise, coherent fluctuations, and the onset of order in an oscillated granular fluid

Details Noise, coherent fluctuations, and the onset of order in an oscillated granular fluid Noise, coherent fluctuations, and the onset of order in an oscillated granular fluid

2003-08-01

arxiv.org/abs/cond-mat/0308028v1

Physical Review Letters 92, 174302 (2004)

Physics

Condensed Matter

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.92.174302

We study fluctuations in a vertically oscillated layer of grains below the critical acceleration for the onset of ordered standing waves. As onset is approached, transient disordered waves with a characteristic length scale emerge and increase in power and coherence. The scaling behavior and the shift in the onset of order agrees with the Swift-Hohenberg theory for convection in fluids. However, the noise in the granular system is four orders of magnitude larger than the thermal noise in a convecting fluid, making the effect of granular noise observable even 20% below the onset of long range order.

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