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arXiv 0909.5339math-phmath.MP
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Riemann曲面和Kasteleyn矩阵上的离散Dirac算子

Discrete Dirac operators on Riemann surfaces and Kasteleyn matrices

David Cimasoni

摘要:

设S是亏格为g的具有锥型奇点的平坦曲面。给定一个等距嵌入到S中的二分图G,我们定义了S上2^{2g} Dirac算子的离散类似物。这些离散的对象,然后收敛到连续的,在某种适当的意义上。最后,我们得到了关于(S,G)的离散Dirac算子是图G的Kasteleyn矩阵的充要条件。因此,如果满足这些条件,则G上二聚体模型的配分函数可以明确地表示为这2^{2g}个离散狄拉克算子的行列式的交替和。

英文摘要:

Let S be a flat surface of genus g with cone type singularities. Given a bipartite graph G isoradially embedded in S, we define discrete analogs of the 2^{2g} Dirac operators on S. These discrete objects are then shown to converge to the continuous ones, in some appropriate sense. Finally, we obtain necessary and sufficient conditions on the pair (S,G) for these discrete Dirac operators to be Kasteleyn matrices of the graph G. As a consequence, if these conditions are met, the partition function of the dimer model on G can be explicitly written as an alternating sum of the determinants of these 2^{2g} discrete Dirac operators.

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