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arXiv 1601.04053cond-mat.stat-mechhep-lat
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自由边界条件下5维伊辛模型的尺度窗口

The scaling window of the 5D Ising model with free boundary conditions

P. H. Lundow, K. Markström

摘要:

具有自由边界条件的五维伊辛模型最近在关于临界温度附近磁化率的有限尺寸标度的争论中重新引起了人们的兴趣。我们提供的证据有利于传统的缩放图片,其中的易感性尺度为$O(L^2)$内的宽度$O(1/L^2)$的关键缩放窗口。我们的研究结果是基于蒙特卡罗数据收集的系统规模高达$L=79$(约。30亿次旋转),用于临界点附近的大范围温度。我们分析的磁化强度分布,磁化率,也包含起源的Fortuin-Kasteleyn集群的大小的缩放和分布。该簇到达边界的概率决定了相关长度,并且其行为与平均场临界指数$δ=3$一致,即缩放窗口具有宽度$O(1/L^2)$。

英文摘要:

The five-dimensional Ising model with free boundary conditions has recently received a renewed interest in a debate concerning the finite-size scaling of the susceptibility near the critical temperature. We provide evidence in favour of the conventional scaling picture, where the susceptibility scales as $O(L^2)$ inside a critical scaling window of width $O(1/L^2)$. Our results are based on Monte Carlo data gathered on system sizes up to $L=79$ (ca. three billion spins) for a wide range of temperatures near the critical point. We analyse the magnetisation distribution, the susceptibility and also the scaling and distribution of the size of the Fortuin-Kasteleyn cluster containing the origin. The probability of this cluster reaching the boundary determines the correlation length, and its behaviour agrees with the mean field critical exponent $δ=3$, that the scaling window has width $O(1/L^2)$.

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