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arXiv 1002.3761cond-mat.stat-mechmath-phmath.COmath.MP
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反铁磁Potts模型的转移矩阵和配分函数零点。VI。具有特殊边界条件的正方形格

Transfer matrices and partition-function zeros for antiferromagnetic Potts models. VI. Square lattice with special boundary conditions

Jesús Salas, Alan D. Sokal

摘要:

使用转移矩阵方法,研究了零温度下正方形晶格q态Potts反铁磁物质(=正方形晶格色多项式)的配分函数零点,这些配分函数零点是从具有自由边界条件的m x n网格中通过邻接最左列中所有位点的一个新顶点和邻接最右列中所有位点的第二个新顶点获得的。我们提供的数值证据表明,配分函数的零变得密集的限制曲线B_ \infty(sq)外的复q平面上的普通(如自由或圆柱)边界条件的模型。尽管如此,无限体积自由能在这个区域是完全解析的。

英文摘要:

We study, using transfer-matrix methods, the partition-function zeros of the square-lattice q-state Potts antiferromagnet at zero temperature (= square-lattice chromatic polynomial) for the special boundary conditions that are obtained from an m x n grid with free boundary conditions by adjoining one new vertex adjacent to all the sites in the leftmost column and a second new vertex adjacent to all the sites in the rightmost column. We provide numerical evidence that the partition-function zeros are becoming dense everywhere in the complex q-plane outside the limiting curve B_\infty(sq) for this model with ordinary (e.g. free or cylindrical) boundary conditions. Despite this, the infinite-volume free energy is perfectly analytic in this region.

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