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” TF R = T /X. On the same system we also measure the effective temperature Tef f , as defined from the generalized fluctuation-dissipation relation, and find a qualitative agreement between the two different nonequilibrium temperatures.
Generalized fluctuation relation and affective temperatures in a driven fluids / Zamponi, F.; Ruocco, Giancarlo; Angelani, AND L.. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 71:(2005), p. 020101. [10.1103/PhysRevE.71.020101]
Generalized fluctuation relation and affective temperatures in a driven fluids.
F. ZAMPONI;RUOCCO, Giancarlo;
2005
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” TF R = T /X. On the same system we also measure the effective temperature Tef f , as defined from the generalized fluctuation-dissipation relation, and find a qualitative agreement between the two different nonequilibrium temperatures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
