Authors: | Böhmer, Roland Diezemann, G. |
Title: | Aging in a free-energy landscape model for glassy relaxation |
Other Titles: | II. Fluctuation-dissipation relations |
Language (ISO): | en |
Abstract: | Several fluctuation-dissipation relations are investigated for a simple free-energy landscape model designed to describe the primary relaxation in supercooled liquids. The calculations of the response and of the correlation functions are performed for a quench from a high temperature to a low temperature. In the model, all dynamical quantities reach equilibrium after long times, but for times shorter than the re-equilibration time they do not exhibit time-translational invariance and the fluctuation-dissipation theorem is violated. Two measures for these violations are considered. One such measure is given by the slope in a plot of the integrated response versus the correlation function and another one by the so-called fluctuation-dissipation ratio. It is found that these measures do not coincide and furthermore are not independent of the dynamical variable considered in the calculation. We propose to determine the fluctuation-dissipation ratio experimentally via measurements of the deuteron spin-lattice relaxation rate and the dielectric loss |
URI: | http://hdl.handle.net/2003/25512 http://dx.doi.org/10.17877/DE290R-3214 |
Issue Date: | 2006 |
Provenance: | American Institute of Physics |
URL: | http://dx.doi.org/10.1103/PhysRevE.74.021506 |
Appears in Collections: | Böhmer, Roland Prof. Dr. |
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