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arXiv 0708.0634math.GRmath.GT
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辫和辫-置换群的泛表示

Universal representations of braid and braid-permutation groups

Barbu Berceanu, Stefan Papadima

摘要:

Drinfel用联结器来构造辫群的泛表示族。我们考虑半关联器(即,我们放弃了五边形公理,并在一次中施加归一化)。我们表明,这个过程可能是相反的,以获得半协会从普遍表示的3-辫子。我们把辫群看作辫-置换群的子群.在不使用结合子的情况下,构造了辫子-置换群的一族泛表示.族中的所有表示都是忠实的,由简单的显式公式在$\bbQ$上定义。我们证明了他们给出了辫子-置换群的万有Vassiliev型不变量。

英文摘要:

Drinfel'd used associators to construct families of universal representations of braid groups. We consider semi-associators (i.e., we drop the pentagonal axiom and impose a normalization in degree one). We show that the process may be reversed, to obtain semi-associators from universal representations of 3-braids. We view braid groups as subgroups of braid-permutation groups. We construct a family of universal representations of braid-permutation groups, without using associators. All representations in the family are faithful, defined over $\bbQ$ by simple explicit formulae. We show that they give universal Vassiliev-type invariants for braid-permutation groups.

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