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In this work we revisit the description of dynamics based on the concepts ofmetabasins and activation in mildly supercooled liquids via the analysis of thedynamics of a paradigmatic glass former between its onset temperature $T_{o}$and mode-coupling temperature $T_{c}$. First, we provide measures thatdemonstrate that the onset of glassiness is indeed connected to the landscape,and that metabasin waiting time distributions are so broad that the system canremain stuck in a metabasin for times that exceed $\tau_\alpha$ by orders ofmagnitude. We then reanalyze the transitions between metabasins, providingseveral indications that the standard picture of activated dynamics in terms oftraps does not hold in this regime. Instead, we propose that here activation isprincipally driven by entropic instead of energetic barriers. In particular, weillustrate that activation is not controlled by the hopping of high energeticbarriers, and should more properly be interpreted as the entropic selection ofnearly barrierless but rare pathways connecting metabasins on the landscape.

Revisiting the Concept of Activation in Supercooled Liquids