The fluctuation-dissipation theorem (FDT), connecting dielectric susceptibility and polarization noise, was studied in glycerol below its glass transition temperature Tg. Weak FDT violations were observed after a quench from just above to just below Tg, for frequencies above the α peak. Violations persisted up to 10⁵ times the thermal equilibration time of the configurational degrees of freedom under study, but comparable to the average relaxation time of the material. These results suggest that excess energy flows from slower to faster relaxing modes.
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Grigera et al. (1999) studied this question.
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