Relaxation and overlap probability function in the spherical and mean spherical model

Details Relaxation and overlap probability function in the spherical and mean spherical model Relaxation and overlap probability function in the spherical and mean spherical model

2002-10-22

arxiv.org/abs/cond-mat/0210502v2

Physics

Condensed Matter

Statistical Mechanics

11 pages, 1 figure, references corrected, to appear in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.66.066113

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 $t^* \sim V^{2/d}$ such that for $t < t^*$ the two models are equivalent, while for $t > t^*$ macroscopic discrepancies arise. The relation between the off equilibrium response function 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.

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