Generalized fluctuation relation and effective temperatures in a driven fluid
Abstract
By numerical simulation of a Lennard-Jones like liquid driven by a velocity gradient γ we test the fluctuation relation (FR) below the (numerical) glass transition temperature Tg. We show that, in this region, the FR deserves to be generalized introducing a numerical factor X(T,γ)<1 that defines an ``effective temperature'' TFR=T/X. On the same system we also measure the effective temperature Teff, as defined from the generalized fluctuation-dissipation relation, and find a qualitative agreement between the two different nonequilibrium temperatures.
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