Relaxation and overlap-probability function in the spherical and mean-spherical models
Nicola Fusco, Marco Zannetti
2002
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
The problem of the equivalence of the spherical and mean spherical models, which has been thoroughly studied and understood in equilibrium, is considered anew from the dynamical point of view during the time evolution following a quench from above to below the critical temperature. It is found that there exists a crossover time t^* ∼ V^2/d such that for t < t^* the two models are equivalent, while for t > t^* macroscopic discrepancies arise. The relation between the off equilibrium response
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... tion and the structure of the equilibrium state, which usually holds for phase ordering systems, is found to hold for the spherical model but not for the mean spherical one. The latter model offers an explicit example of a system which is not stochastically stable.
doi:10.1103/physreve.66.066113
pmid:12513353
fatcat:wspog3co7nhp5dhdskzsggjm3u