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We study by light microscopy a soft glass consisting of a compact arrangementof polydisperse elastic spheres. We show that its slow and non-stationarydynamics results from the unavoidable small fluctuations of temperature, whichinduce intermittent local mechanical shear in the sample, because of thermalexpansion and contraction. Temperature-induced shear provokes both reversibleand irreversible rearrangements whose amplitude decreases with time, leading toan exponential slowing down of the dynamics with sample age.Comment: published in PRL 97, 238301, 200

Origin of the Slow Dynamics and the Aging of a Soft Glass