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arXiv 0912.4549cond-mat.stat-mech
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超可积手征Potts模型的自发磁化:行列式D_PQ的计算

Spontaneous magnetization of the superintegrable chiral Potts model: calculation of the determinant D_PQ

R. J. Baxter

摘要:

对于伊辛模型,自发磁化强度的计算导致了行列式的计算问题。杨通过计算大晶格极限中的本征值做到了这一点。Montroll、Potts和Ward将其表示为Toeplitz行列式,并使用了Szego定理:这几乎可以肯定是Onsager最初旅行的路线。对于超可积手征Potts模型中的相应问题,这两种方法似乎都不起作用:在这里,我们证明了行列式D_PQ可以表示为两个Cauchy-like矩阵的乘积。然后可以使用柯西行列式的初等精确公式。其中一个当然恢复已知的结果,最初在1989年公布。

英文摘要:

For the Ising model, the calculation of the spontaneous magnetization leads to the problem of evaluating a determinant. Yang did this by calculating the eigenvalues in the large-lattice limit. Montroll, Potts and Ward expressed it as a Toeplitz determinant and used Szego's theorem: this is almost certainly the route originally travelled by Onsager. For the corresponding problem in the superintegrable chiral Potts model, neither approach appears to work: here we show that the determinant D_PQ can be expressed as that of a product of two Cauchy-like matrices. One can then use the elementary exact formula for the Cauchy determinant. One of course regains the known result, originally conjectured in 1989.

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