6533b82bfe1ef96bd128d7fe
RESEARCH PRODUCT
Aging effects in simple models for glassy relaxation
Gregor Diezemannsubject
Thermal equilibriumFluctuation-dissipation theoremChemistryRandom energy modelmedia_common.quotation_subjectFOS: Physical sciencesThermodynamicsCondensed Matter - Soft Condensed MatterCondensed Matter PhysicsAsymmetryElectronic Optical and Magnetic MaterialsExponential functionCorrelation function (statistical mechanics)Materials ChemistryCeramics and CompositesSoft Condensed Matter (cond-mat.soft)Relaxation (physics)Scalingmedia_commondescription
Aging effects in the two-time correlation function and the response function after a quench from a high temperature to some low temperature are considered for a simple kinetic random energy model exhibiting stretched exponential relaxation. Because the system reaches thermal equilibrium for long times after the quench, all aging effect are of a transient nature. In particular, the violations of the fluctuation-dissipation theorem are considered and it is found that the relation between the response and the two-time correlation function depends on another function, the so-called asymmetry. This asymmetry vanishes in equilibrium but cannot be neglected in the aging regime. It is found that plots of the integrated response versus the correlation function are not applicable to quantify the violations of the fluctuation-dissipation theorem in this particular model. This fact has its origin in the absence of a scaling form of the correlation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-17 |