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arXiv math/0012194math.QAhep-thmath-phmath.MP
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基于初等群理论的A型融合规则

Type A fusion rules from elementary group theory

Alex J. Feingold, Michael D. Weiner

摘要:

本文证明了如何从初等群理论中得到A_{n-1}型仿射Kac-Moody李代数g(n = 2或3)的融合规则.第k个对称群S_k作用于模n的整数k元组Z_n^k上的轨道与g的k级融合代数的一个基一一对应。若[a],[b],[c]是任意三个轨道,则S_k作用于T([a],[b],[c])= {(x,y,z)\in [a]x[b]x[c],使得x+y+z=0},在该作用下分解为有限个轨道M([a],[b],[c])。令N = N([a],[b],[c])表示与融合代数的元素的三元组相关联的融合系数。当n = 2时,我们证明M([a],[b],[c])= N;当n = 3时,我们证明M([a],[b],[c])= N(N+1)/2。这扩展了先前关于Virasoro极小模型的融合规则的工作[Akman,Feingold,Weiner,来自2-群的极小模型融合规则,Letters in Math.Phys.40(1997),159-169]。

英文摘要:

We show how the fusion rules for an affine Kac-Moody Lie algebra g of type A_{n-1}, n = 2 or 3, for all positive integral level k, can be obtained from elementary group theory. The orbits of the kth symmetric group, S_k, acting on k-tuples of integers modulo n, Z_n^k, are in one-to-one correspondence with a basis of the level k fusion algebra for g. If [a],[b],[c] are any three orbits, then S_k acts on T([a],[b],[c]) = {(x,y,z)\in [a]x[b]x[c] such that x+y+z=0}, which decomposes into a finite number, M([a],[b],[c]), of orbits under that action. Let N = N([a],[b],[c]) denote the fusion coefficient associated with that triple of elements of the fusion algebra. For n = 2 we prove that M([a],[b],[c]) = N, and for n = 3 we prove that M([a],[b],[c]) = N(N+1)/2. This extends previous work on the fusion rules of the Virasoro minimal models [Akman, Feingold, Weiner, Minimal model fusion rules from 2-groups, Letters in Math. Phys. 40 (1997), 159-169].

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