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arXiv math/0202214math.GTmath.RT
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Lawrence-Krammer表示是酉表示

The Lawrence--Krammer representation is unitary

Won Taek Song

摘要:

我们证明了Lawrence-Krammer表示是酉的。我们明确地提出了非奇异矩阵表示的作用下的半双线性对不变量。我们发现,扭转方向的辫子是相当于转座的劳伦斯-Krammer矩阵,然后由一定的共轭。作为推论,它示出的特征多项式的Lawrence-Krammer矩阵是不变的下替换其变量与其逆乘单位,并不是一个完整的共轭不变的辫子。

英文摘要:

We show that the Lawrence--Krammer representation is unitary. We explicitly present the non-singular matrix representing the sesquilinear pairing invariant under the action. We show that reversing the orientation of a braid is equivalent to the transposition of its Lawrence--Krammer matrix followed by a certain conjugation. As corollaries it is shown that the characteristic polynomial of the Lawrence--Krammer matrix is invariant under substitution of its variables with their inverses up to multiplication by units, and is not a complete conjugacy invariant for braids.

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