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arXiv 1608.08473math.PRmath-phmath.MP
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树上随机回路模型的临界参数

Critical parameter of random loop model on trees

Jakob E. Björnberg, Daniel Ueltschi

摘要:

我们给出了与量子自旋系统相关的随机环模型的临界参数的估计。我们考虑的模型的一个特殊情况是交换或随机搅拌过程。我们在这里考虑的模型定义在正规树的大程度,预计近似高的空间维度。我们发现一个关键的参数,确实共享与现有的数值结果的立方晶格相似。在交换过程的情况下,我们的结果改善了早期的工作由天使和哈蒙德,在我们确定的临界参数的二阶项。

英文摘要:

We give estimates of the critical parameter for random loop models that are related to quantum spin systems. A special case of the model that we consider is the interchange- or random-stirring process. We consider here the model defined on regular trees of large degrees, which are expected to approximate high spatial dimensions. We find a critical parameter that indeed shares similarity with existing numerical results for the cubic lattice. In the case of the interchange process our results improve on earlier work by Angel and by Hammond, in that we determine the second-order term of the critical parameter.

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