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We use Time Resolved Correlation (TRC), a recently introduced lightscattering method, to study the dynamics of a variety of jammed, or glassy,soft materials. The output of a TRC experiment is cI(t,tau), the time series ofthe degree of correlation between the speckle patterns generated by the lightscattered at time t and t+tau. We characterize the fluctuations of cI bycalculating their Probability Density Function, their variance as a function ofthe lag tau, and their time autocorrelation function. The comparison betweenthese quantities for a Brownian sample and for jammed materials indicateunambiguously that the slow dynamics measured in soft glasses is temporallyheterogeneous. The analogies with recent experimental, numerical andtheoretical work on temporal heterogeneity in the glassy dynamics are brieflydiscussed.Comment: date de la fin de redaction : 06/09/200

Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics