Effective temperature of an aging powder

Details Effective temperature of an aging powder Effective temperature of an aging powder

2000-12-14

arxiv.org/abs/cond-mat/0012273v3

Phys. Rev. E 63, 060301 (2001).

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures; to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.63.060301

The aging dynamics and the fluctuation-dissipation relation between the spontaneous diffusion induced by a random noise and the drift motion induced by a small stirring force are numerically investigated in a 3D schematic model of compacting powder: a gravity-driven lattice-gas with kinetic constraints. The compaction dynamics is characterized by a super-aging behaviour and, in analogy with glasses, exhibits a purely dynamical time-scale dependent effective temperature. A simple experiment to measure this quantity is suggested.

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