Some exact results on the Potts model partition function in a magnetic field
Some exact results on the Potts model partition function in a magnetic field
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磁场中 Potts 模型配分函数的一些精确结果
DOI:
10.1088/1751-8113/42/38/385004
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
R. Shrock
中科院分区:
文献类型:
--
作者:
Shu;R. Shrock
We consider the Potts model in a magnetic field on an arbitrary graph G. Using a formula by F Y Wu for the partition function Z of this model as a sum over spanning subgraphs of G, we prove some properties of Z concerning factorization, monotonicity and zeros. A generalization of the Tutte polynomial is presented that corresponds to this partition function. In this context, we formulate and discuss two weighted graph-coloring problems. We also give a general structural result for Z for cyclic strip graphs.