arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1708.09677math.PRcond-mat.stat-mech
收藏

Ising和Potts模型在低温区的隧穿行为

Tunneling behavior of Ising and Potts models in the low-temperature regime

Francesca R. Nardi, Alessandro Zocca

摘要:

我们考虑有限体积中零外场铁磁$q$态Potts模型,并假设该系统的随机演化由逆温度$β$参数化的Glauber型动力学描述.我们的分析涉及低温区域$β\to \infty$,其中该多自旋系统具有$q$稳定平衡,对应于所有自旋相等的构型。本文以网格图为研究对象,研究了$q$ -态Potts模型的隧穿现象.更具体地说,我们描述了稳定平衡点之间的首中时的渐近行为作为$β\to \infty$在概率,期望,和分布,并获得严格的边界上的混合时间作为副结果。在特殊的情况下,$q=2$,我们的结果描述了网格图上的伊辛模型的隧穿行为。

英文摘要:

We consider the ferromagnetic $q$-state Potts model with zero external field in a finite volume and assume that the stochastic evolution of this system is described by a Glauber-type dynamics parametrized by the inverse temperature $β$. Our analysis concerns the low-temperature regime $β\to \infty$, in which this multi-spin system has $q$ stable equilibria, corresponding to the configurations where all spins are equal. Focusing on grid graphs with various boundary conditions, we study the tunneling phenomena of the $q$-state Potts model. More specifically, we describe the asymptotic behavior of the first hitting times between stable equilibria as $β\to \infty$ in probability, in expectation, and in distribution and obtain tight bounds on the mixing time as side-result. In the special case $q=2$, our results characterize the tunneling behavior of the Ising model on grid graphs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑