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The density response of supercooled glycerol to an impulsive stimulatedthermal grating (q=0.63 micron^-1) has been studied in the temperature range(T=200-340 K) where the structure rearrangement (alpha-relaxation) and thermaldiffusion occur on the same time scale. A strong interaction between the twomodes occurs giving rise to a dip in the T-dependence of the apparent thermalconductivity and a flattening of the apparent alpha-relaxation time uponcooling. A non-equilibrium thermodynamic (NET) model for the long time responseof relaxing fluids has been developed. The model is capable to reproduce theexperimental data and to explain the observed phenomenology.Comment: to be published in PRE Rapid Commu

Nonequilibrium thermodynamic description of the coupling between structural and entropic modes in supercooled liquids