Metastability for reversible probabilistic cellular automata with self-interaction

被引:33
作者
Cirillo, Emilio N. M. [1 ]
Nardi, Francesca R. [2 ,4 ]
Spitoni, Cristian [3 ,4 ]
机构
[1] Univ Roma La Sapienza, Dipartimento Me Mo Mat, I-00161 Rome, Italy
[2] Eindhoven Univ Technol, Dept Math & Comp Sci, NL-5600 MB Eindhoven, Netherlands
[3] Leiden Univ, Inst Math, NL-2300 RA Leiden, Netherlands
[4] Eurandom, NL-5600 MB Eindhoven, Netherlands
关键词
stochastic dynamics; probabilistic cellular automata; metastability; low temperature dynamics;
D O I
10.1007/s10955-008-9563-6
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The problem of metastability for a stochastic dynamics with a parallel updating rule is addressed in the Freidlin-Wentzel regime, namely, finite volume, small magnetic field, and small temperature. The model is characterized by the existence of many fixed points and cyclic pairs of the zero temperature dynamics, in which the system can be trapped in its way to the stable phase. Our strategy is based on recent powerful approaches, not needing a complete description of the fixed points of the dynamics, but relying on few model dependent results. We compute the exit time, in the sense of logarithmic equivalence, and characterize the critical droplet that is necessarily visited by the system during its excursion from the metastable to the stable state. We need to supply two model dependent inputs: (1) the communication energy, that is the minimal energy barrier that the system must overcome to reach the stable state starting from the metastable one; (2) a recurrence property stating that for any configuration different from the metastable state there exists a path, starting from such a configuration and reaching a lower energy state, such that its maximal energy is lower than the communication energy.
引用
收藏
页码:431 / 471
页数:41
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