If the Boltzmann-Gibbs state ω N of a mean-field N-particle system with Hamil-tonian H N verifies the condition ω N(H N) ≥ ω N(H Ni+H N2) for every decomposition N 1 + N 2 = N, then its free energy density increases with N. We prove such a condition for a wide class of spin models which includes the Curie-Weiss model, its p-spin generalizations (for both even and odd p), its random field version and also the finite pattern Hopfield model. For all these cases the existence of the thermodynamic limit by subadditivity and boundedness follows.
Bianchi, A., Contucci, P., Giardina, C. (2003). Thermodynamic limit for mean-field spin models. MPEJ, 9, 1-15.
Thermodynamic limit for mean-field spin models
Contucci P.;
2003
Abstract
If the Boltzmann-Gibbs state ω N of a mean-field N-particle system with Hamil-tonian H N verifies the condition ω N(H N) ≥ ω N(H Ni+H N2) for every decomposition N 1 + N 2 = N, then its free energy density increases with N. We prove such a condition for a wide class of spin models which includes the Curie-Weiss model, its p-spin generalizations (for both even and odd p), its random field version and also the finite pattern Hopfield model. For all these cases the existence of the thermodynamic limit by subadditivity and boundedness follows.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
