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arXiv 0811.4204math.GR
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辫群的新置换表示

New Permutation Representations of the Braid Group

Amiel Ferman, Tahl Nowik, Robert Schwartz, Mina Teicher

摘要:

本文给出了一个新的从辫群B_k到对称群S_{mk}的群同态的无限族,其中k和m都是\geq 2.大多数已知的编织物的置换表示都包括在这个家族中。我们证明了这类同态是非循环的和传递的。对m的任意因子l,1 \leq l < m,我们特别证明了:如果\frac{m}{l}是奇数,则有1 + \frac{m}{l}非共轭同态包含在我们的族中.我们对同态B_k到S_n定义了一个自然的限制,它是我们族中所有同态所共有的,我们称之为“好的”,它有两种类型。证明了1型的好同态B_k到S_{mk}都包含在我们给出的无限同态族中。当m=3时,我们证明了2型的所有好同态B_k到S_{3k}也包含在这个族中.最后,我们反驳了Matei和Suciu关于辫子的置换表示的一个猜想,并给出了一个更新的猜想。

英文摘要:

We give a new infinite family of group homomorphisms from the braid group B_k to the symmetric group S_{mk} for all k and m \geq 2. Most known permutation representations of braids are included in this family. We prove that the homomorphisms in this family are non-cyclic and transitive. For any divisor l of m, 1\leq l < m, we prove in particular that if \frac{m}{l} is odd then there are 1 + \frac{m}{l} non-conjugate homomorphisms included in our family. We define a certain natural restriction on homomorphisms B_k to S_n, common to all homomorphisms in our family, which we term 'good', and of which there are two types. We prove that all good homomorphisms B_k to S_{mk} of type 1 are included in the infinite family of homomorphisms we gave. For m=3, we prove that all good homomorphisms B_k to S_{3k} of type 2 are also included in this family. Finally, we refute a conjecture made by Matei and Suciu regarding permutation representations of braids and give an updated conjecture.

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