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arXiv 1601.04286cond-mat.stat-mech
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不可逆模拟回火

Irreversible simulated tempering

Yuji Sakai, Koji Hukushima

摘要:

通过在模拟回火温度反演的更新方案中引入对细致平衡条件的破坏,提出了一种扩展的系综Monte Carlo算法。我们的方法,不可逆模拟回火,是建立在框架的斜细致平衡条件。以二维正方晶格上的铁磁伊辛模型为例,数值研究了温度反演和磁化强度自相关函数的动力学行为.研究发现,逆温度的弛豫动力学性质的变化从扩散弹道违反细致平衡条件。因此,磁化的自相关时间比满足细致平衡条件的常规算法小几倍。

英文摘要:

An extended ensemble Monte Carlo algorithm is proposed by introducing a violation of the detailed balance condition to the update scheme of the inverse temperature in simulated tempering. Our method, irreversible simulated tempering, is constructed based on the framework of the skew detailed balance condition. By applying this method to the ferromagnetic Ising model in two dimensions on a square lattice as a benchmark, the dynamical behavior of the inverse temperature and an autocorrelation function of the magnetization are studied numerically. It is found that the relaxation dynamics of the inverse temperature changes qualitatively from diffusive to ballistic by violating the detailed balance condition. Consequently, the autocorrelation time of magnetization is several times smaller than that for the conventional algorithm satisfying the detailed balance condition.

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