Phys. Rev. Lett. 96, 118002 (2006) [4 pages]Brownian Forces in Sheared Granular MatterReceived 27 July 2005; published 23 March 2006 We present results from a series of experiments on a granular medium sheared in a Couette geometry and show that their statistical properties can be computed in a quantitative way from the assumption that the resultant from the set of forces acting in the system performs a Brownian motion. The same assumption has been utilized, with success, to describe other phenomena, such as the Barkhausen effect in ferromagnets, and so the scheme suggests itself as a more general description of a wider class of driven instabilities. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.118002
DOI:
10.1103/PhysRevLett.96.118002
PACS:
45.70.−n, 05.40.−a, 75.60.Ej
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