Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-07-23
Physics
Condensed Matter
Soft Condensed Matter
Latex file, 8 pages + 5 postscript figures
Scientific paper
10.1209/epl/i2003-10158-3
We consider heat exchange processes between non-equilibrium aging systems (in their activated regime) and the thermal bath in contact. We discuss a scenario where two different heat exchange processes concur in the overall heat dissipation: a stimulated fast process determined by the temperature of the bath and a spontaneous intermittent process determined by the fact that the system has been prepared in a non-equilibrium state. The latter is described by a probability distribution function (PDF) that has an exponential tail of width given by a parameter $\lambda$, and satisfies a fluctuation theorem (FT) governed by that parameter. The value of $\lambda$ is proportional to the so-called effective temperature, thereby providing a practical way to experimentally measure it by analyzing the PDF of intermittent events.
Crisanti Andrea
Ritort Felix
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