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arXiv 1708.04833math.RTmath.QAmath.RA
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任意Coxeter系统的Birman-Murakami-Wenzl型代数

Birman-Murakami-Wenzl type algebras for arbitrary Coxeter systems

Zhi Chen

摘要:

本文首先给出了秩为2的Coxeter系(对应于二面体群)的Birman-Murakami-Wenzl型代数。我们证明了它们对于一般参数是半单的,并且具有自然的胞状结构。并分类它们的不可约表示。其中有一个作为一个推广的劳伦斯-克拉默表示相当整齐的形状和“正确”的尺寸。我们猜想它们同构于I.Marin定义的某些KZ联络的广义Lawrence-Krammer表示。我们证明了这些表示是不可约的一般参数,并找到一个相当整洁的不变双线性型。基于上述秩为2的构造,我们引入了任意Coxeter系统的Birman-Murakami-Wenzl型代数.对于每个Coxeter系统,引入的代数是Artin群(与该Coxeter系统相关)的群代数的商,具有相应的Hecke代数作为商。Artin群的单生成元在这个代数中有3次零化多项式。

英文摘要:

In this paper we first present a Birman-Murakami-Wenzl type algebra for every Coxeter system of rank 2 (corresponding to dihedral groups). We prove they have semisimple for generic parameters, and having natural cellular structures. And classcify their irreducible representations. Among them there is one serving as a generalization of the Lawrence-Krammer representation with quite neat shape and the "correct" dimension. We conjecture they are isomorphic to the generalized Lawrence-Krammer representaions defined by I.Marin as monodromy of certain KZ connections. We prove these representations are irreducible for generic parameters, and find a quite neat invariant bilinear form on them. Based on above constructions for rank 2, we introduce a Birman-Murakami-Wenzl type algebra for an arbitrary Coxeter system. For every Coxeter system, the introduced algebra is a quotient of group algebra of the Artin group (associated with this Coxeter system), having the corresponding Hecke algebra as a quotient. The simple generators of the Artin group have degree 3 annihiating polynomials in this algebra.

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