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Abstract

Glasses are well-known for their non-linear response to small external perturbations. This property is well-known to be a consequence of the sluggish dynamics of glassy systems. Non linear response is expected if the inherent structural relaxation time is longer than the time scale probed by the experiment. Interestingly, deep in the glassy phase, non-linearity is often accompanied by heterogeneity in the system response. We address this issue by means of molecular dynamics simulations and simple theoretical arguments.