A scaling law describes the spin-glass response in theory, experiments and simulations*

The dynamical arrest found upon cooling glass formers to their glass temperature T_g is caused by the unbounded expansion of cooperative regions as T_g is approached or as the system is left to age below T_g. It is extremely difficult to measure quantities that are accessible both to experiment and simulations, which has led to seemingly irreconcilable approaches.
We solved this dilemma in a framework that harmonizes experiments with theory. We conduct a parallel study of spin-glass dynamics both in an experiment in a CuMn single crystal and in simulations of the Ising-Edwards-Anderson (IEA) model carried out on the Janus II custom-built supercomputer. We introduced a scaling law that describes the system's response over its entire natural range of variation.