Seoane Bartolomé, BeatrizZamponi, Francesco2025-01-282025-01-282018B. Seoane and F. Zamponi, Soft Matter, 2018, 14, 5222–5234.1744-683X10.1039/C8SM00859Khttps://hdl.handle.net/20.500.14352/116716Motivated by the mean field prediction of a Gardner phase transition between a "normal glass" and a "marginally stable glass", we investigate the off-equilibrium dynamics of three-dimensional polydisperse hard spheres, used as a model for colloidal or granular glasses. Deep inside the glass phase, we find that a sharp crossover pressure PG separates two distinct dynamical regimes. For pressure P < P-G, the glass behaves as a normal solid, displaying fast dynamics that quickly equilibrate within the glass free energy basin. For P > P-G, instead, the dynamics become strongly anomalous, displaying very large equilibration timescales, aging, and a constantly increasing dynamical susceptibility. The crossover at P-G is strongly reminiscent of the one observed in three-dimensional spin-glasses in an external field, suggesting that the two systems could be in the same universality class, consistent with theoretical expectations.engjournal article1744-6848https://doi.org/10.1039/C8SM00859Khttps://pubs.rsc.org/en/content/articlelanding/2018/sm/c8sm00859khttps://arxiv.org/pdf/1803.05031open access53DynamicsFree energyGlassGlass transitionSpin glassFísica (Física)22 Física