Abstract
We propose that the salient feature to be explained about the glasstransition of supercooled liquids is the temperature-controlledsuper-Arrhenius activated nature of the viscous slowing down, morestrikingly seen in weakly bonded, fragile systems. In the light ofthis observation, the relevance of simple models of sphericallyinteracting particles and that of models based on free-volumecongested dynamics are questioned. Finally, we discuss how the mainaspects of the phenomenology of supercooled liquids, including thecrossover from Arrhenius to super-Arrhenius activated behaviour and theheterogeneous character of the α-relaxation, can be described by anapproach based on frustration-limited domains.
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