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The specific heat capacity $c_v$ of glass formers undergoes a hysteresis whensubjected to a cooling-heating cycle, with a larger $c_v$ and a more pronouncedhysteresis for fragile glasses than for strong ones. Here, we show that theseexperimental features, including the unusually large magnitude of $c_v$ offragile glasses, are well reproduced by kinetic Monte Carlo and equilibriumstudy of a distinguishable particle lattice model (DPLM) incorporating atwo-state picture of particle interactions. The large $c_v$ in fragile glassesis caused by a dramatic transfer of probabilistic weight from high-energyparticle interactions to low-energy ones as temperature decreases.

Large heat-capacity jump in cooling-heating of fragile glass from kinetic Monte Carlo simulations based on a two-state picture