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  • Title: Local quasi-equilibrium description of slow relaxation systems.
    Author: Santamaría-Holek I, Pérez-Madrid A, Rubí JM.
    Journal: J Chem Phys; 2004 Feb 08; 120(6):2818-23. PubMed ID: 15268428.
    Abstract:
    We present a dynamical description of slow relaxation processes based on the extension of Onsager's fluctuation theory to systems in local quasi-equilibrium. A non-Markovian Fokker-Planck equation for the conditional probability density is derived, and from it we obtain the relaxation equation for the moments. We show that the fluctuation-dissipation theorem can be formulated in terms of the temperature of the system at local quasi-equilibrium which is related to that of the bath by means of a scaling factor revealing lack of thermal equilibrium. Our theory may be applied to a wide variety of systems undergoing slow relaxation. We discuss in particular slow dynamics in glassy systems and Brownian motion in a granular gas.
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