Out-of-equilibrium dynamics in a gaussian trap model

Abstract

The violations of the fluctuation-dissipation theorem are analyzed for a trap model with a gausssian density of states. In this model, the system reaches thermal equilibrium for long times after a quench to any finite temperature and therefore all aging effect are of a transient nature. For not too long times after the quench it is found that the so-called fluctuation-dissipation ratio tends to a non-trivial limit, thus inicating the possibility for the definition of a time scale dependent effective temperature. However, different definitions of the effective temperature yield distinct results. In particular plots of the integrated response versus the correlation function strongly depend on the way they are constructed. Also the definition of effective temperatures in the frequency domain is not unique for the model considered. This may have some implications for the interpretation of results from computer simulations and experimental determinations of effective temperatures.

Proceedings of the workshop on non-equilibrium phenomena in supercooled fluids, glasses and amorphous materials (17-22 September, Pisa)

References in corpus (14)

• Glassy dynamics of kinetically constrained models
• Violation of the fluctuation-dissipation theorem in glassy systems: basic notions and the numerical evidence
• Energy Barriers and Activated Dynamics in a Supercooled Lennard-Jones Liquid
• Probing an nonequilibrium Einstein relation in an aging colloidal glass
• Kovacs effects in an aging molecular liquid
• Experimental study of the Fluctuation-Dissipation-Relation during an aging process
• Does the potential energy landscape of a supercooled liquid resemble a collection of traps?
• Intermittent origin of the large violations of the fluctuation dissipation relations in an aging polymer glass
• Aging in a free-energy landscape model for glassy relaxation
• Distributions of inherent structure energies during aging
• Mode-Dependent nonequilibrium temperature in aging systems
• Fluctuation-dissipation relations in trap models
• Universal dependence of the fluctuation-dissipation ratio on the transition rates in trap models
• Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong glass-forming liquid

Cited by in corpus (7)

• Nonlinear response theory for Markov processes: Simple models for glassy relaxation
• Non-equilibrium dynamics of spin facilitated glass models
• Aging effects manifested in the potential energy landscape of a model glass former
• Memory effects in the relaxation of the Gaussian trap model
• Higher-order correlation functions and nonlinear response functions in a Gaussian trap model
• Nonlinear response theory for Markov processes II: Fifth-order response functions
• Nonlinear response functions in an exponential trap model