Two time scales and violation of the fluctuation-dissipation theorem in a finite dimensional model for structural glasses
We study the breakdown of fluctuation-dissipation relations between time-dependent density-density correlations and associated responses following a quench in the chemical potential in the frustrated Ising lattice gas. The corresponding slow dynamics is characterized by two well-separated time scales characterized by a constant value of the fluctuation-dissipation ratio. This result is particularly relevant since activated processes dominate the long-time dynamics of the system.
Ricci-Tersenghi
F
Abdus Salam International Center for Theoretical Physics, Condensed Matter Group, Strada Costiera 11, P.O. Box 586, 34100 Trieste, Italy.
Stariolo
DA
Arenzon
JJ