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Transitions between metabasins in supercooled liquids seem to occur throughrapid "democratic" collective particle rearrangements. Here we show that thisapparent homogeneous particle motion is a direct consequence of dynamicfacilitation. We do so by studying metabasin transitions in facilitated spinmodels and constrained lattice gases. We find that metabasin transitions occurthrough a sequence of locally facilitated events taking place over a relativelyshort time frame. When observed on small enough spatial windows these eventsappear sudden and homogeneous. Our results indicate that metabasin transitionsare essentially "non-democratic" in origin and yet another manifestation ofdynamical heterogeneity in glass formers.

Dynamic facilitation explains democratic particle motion of metabasin transitions