Figure 4

Figure 4: Time dependence of the susceptibility χ4(t) that quantifies spontaneous fluctuations of the relaxation function in a molecular dynamics simulation of a supercooled liquid. For each temperature, χ4(t) has a maximum, which shifts to larger times and has a larger value when T is decreased, revealing the increasing length scale of dynamic heterogeneity in supercooled liquids that approach the glass transition.