We consider Glauber-type dynamics for disordered Ising spin systems with nearest neighbor pair interactions in the Griffiths phase. We prove that in a nontrivial portion of the Griffiths phase the system has exponentially decaying correlations of distant functions with probability exponentially close to 1. This condition has, in turn, been shown elsewhere to imply that the convergence to equilibrium is faster than any stretched exponential, and that the average over the disorder of the time-autocorrelation function goes to equilibrium faster than exp[-k(log t)(d/(d-1))]. We then show that for the diluted Ising model these upper bounds are optimal.
Convergence to Equilibrium of Random Ising Models in the Griffiths' Phase / Alexander, K.; Cesi, Filippo; Chayes, L.; Maes, C.; Martinelli, F.. - In: JOURNAL OF STATISTICAL PHYSICS. - ISSN 0022-4715. - 92:(1998), p. 337. [10.1023/A:1023077101354]
Convergence to Equilibrium of Random Ising Models in the Griffiths' Phase
CESI, Filippo;
1998
Abstract
We consider Glauber-type dynamics for disordered Ising spin systems with nearest neighbor pair interactions in the Griffiths phase. We prove that in a nontrivial portion of the Griffiths phase the system has exponentially decaying correlations of distant functions with probability exponentially close to 1. This condition has, in turn, been shown elsewhere to imply that the convergence to equilibrium is faster than any stretched exponential, and that the average over the disorder of the time-autocorrelation function goes to equilibrium faster than exp[-k(log t)(d/(d-1))]. We then show that for the diluted Ising model these upper bounds are optimal.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.