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According to the Random First Order Transition (RFOT) theory of glasses, thebarriers for activated dynamics in supercooled liquids vanish as thetemperature of a viscous liquid approaches the dynamical transition temperaturefrom below. This occurs due to a decrease of the surface tension between localmeta-stable molecular arrangements much like at a spinodal. The dynamicaltransition thus represents a crossover from the low $T$ activated bevavior to acollisional transport regime at high $T$. This barrier softening explains thedeviation of the relaxation times, as a function of temperature, from thesimple $\log \tau \propto 1/s_c$ dependence at the high viscosity to amode-mode coupling dominated result at lower viscosity. By calculating thebarrier softening effects, the RFOT theory provides a {\em unified} microscopicway to interpret structural relaxation data for many distinct classes ofstructural glass formers over the measured temperature range. The theory alsoprovides an unambiguous procedure to determine the size of dynamicallycooperative regions in the presence of barrier renormalization effects usingthe experimental temperature dependence of the relaxation times and theconfigurational entropy data. We use the RFOT theory framework to discuss datafor tri-naphthyl benzene, salol, propanol and silica as representative systems.Comment: Submitted to J. Chem. Phy

the journal of chemical physics

Barrier softening near the onset of nonactivated transport in supercooled liquids: Implications for establishing detailed connection between thermodynamic and kinetic anomalies in supercooled liquids