Fluctuations of internal energy flow in a vibrated granular gas

Details Fluctuations of internal energy flow in a vibrated granular gas Fluctuations of internal energy flow in a vibrated granular gas

2005-09-05

arxiv.org/abs/cond-mat/0509105v1

Phys. Rev. Lett. 95, 110202 (2005)

Physics

Condensed Matter

Statistical Mechanics

accepted for publication on Physical Review Letter

Scientific paper

10.1103/PhysRevLett.95.110202

The non-equilibrium fluctuations of power flux in a fluidized granular media have been recently measured in an experiment [Phys. Rev. Lett. 92, 164301, 2004], which was announced to be a verification of the Fluctuation Relation (FR) by Gallavotti and Cohen. An effective temperature was also identified and proposed to be a useful probe for such non equilibrium systems. We explain these results in terms of a two temperature Poisson process. Within this model, supported by independent Molecular Dynamics simulations, power flux fluctuations do not satisfy the FR and the nature of the effective temperature is clarified. In the pursue of a hypothetical global quantity fulfilling the FR, this points to the need of considering other candidates than the power flux.

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