Local fluctuations and FDR violations in aging glass

Abstract Dipolar fluctuations were measured in both macroscopic samples, and locally in mesoscopic volumes of polymer glass. Following a temperature quench, the macroscopic measurements revealed fluctuation–dissipation-relation (FDR) violations with a complex dependence on aging time and measurement frequency. New results on imaging mesoscopic spatio-temporal fluctuations, and the possibility of using this technique to study the heterogeneity of aging and local FDR violations will be discussed.