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The interpretation of experimental and numerical data describingoff-equilibrium aging dynamics crucially depends on the connection betweenspontaneous and induced fluctuations. The hypothesis that linear responsefluctuations are statistically subordinated to irreversible outbursts ofenergy, so-called quakes, leads to predictions for averages and fluctuationsspectra of physical observables in reasonable agreement with experimentalresults [see e.g. Sibani et al., Phys. Rev. B74:224407, 2006]. Usingsimulational data from a simple but representative Ising model with plaquetteinteractions, direct statistical evidence supporting the hypothesis ispresented and discussed in this work.  A strict temporal correlation between quakes and intermittent magnetizationfluctuations is demonstrated. The external magnetic field is shown to bias thepre-existent intermittent tails of the magnetic fluctuation distribution, withlittle or no effect on the Gaussian part of the latter. Its impact on energyfluctuations is shown to be negligible.  Linear response is thus controlled by the quakes and inherits their temporalstatistics. These findings provide a theoretical basis for analyzingintermittent linear response data from aging system in the same way as thermalenergy fluctuations, which are far more difficult to measure.

Linear response subordination to intermittent energy release in off-equilibrium aging dynamics