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Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids (Articolo in rivista)
- Type
- Label
- Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.4901526 (literal)
- Alternative label
Ninarello, Andrea Saverio; Gnan, Nicoletta; Sciortino, Francesco (2014)
Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids
in The Journal of chemical physics
(literal)
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- Ninarello, Andrea Saverio; Gnan, Nicoletta; Sciortino, Francesco (literal)
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- Sapienza University Rome; CNR ISC Uos Sapienza (literal)
- Titolo
- Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids (literal)
- Abstract
- We discuss the observable-dependence of the effective temperature T-eff, defined via the fluctuation-dissipation relation, of an out-of-equilibrium system composed by homonuclear dumbbell molecules. T-eff is calculated by evaluating the fluctuation and the response for two observables associated, respectively, to translational and to rotational degrees of freedom, following a sudden temperature quench. We repeat our calculations for different dumbbell elongations zeta. At high elongations (zeta > 0.4), we find the same T-eff for the two observables. At low elongations (zeta <= 0.4), only for very deep quenches T-eff coincides. The observable-dependence of T-eff for low elongations and shallow quenches stresses the importance of a strong coupling between orientational and translational variables for a consistent definition of the effective temperature in glassy systems. (c) 2014 AIP Publishing LLC. (literal)
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