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arXiv 1006.4285math.GT
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扭Alexander多项式与2-桥纽结群的character簇

Twisted Alexander polynomials and character varieties of 2-bridge knot groups

Taehee Kim, Takayuki Morifuji

摘要:

本文从纽结群的非交换表示的SL(2,C)-特征簇的角度研究扭Alexander多项式.已知如果一个纽结是纤维化的,那么与非交换SL(2,C)-表示相关的扭曲亚历山大多项式都是幺一的。在本文中,我们证明了相反的2桥结。此外,我们表明,对于一个2-桥结存在一个曲线组成部分的SL(2,C)-字符品种,如果没有纤维结,那么只有1000多字符的组成部分,相关的扭曲亚历山大多项式是monic。我们还表明,对于亏格为g的2-桥结,在上述曲线分量中,对于所有的特征,相关的扭曲亚历山大多项式的次数为4g-2。

英文摘要:

We study the twisted Alexander polynomial from the viewpoint of the SL(2,C)-character variety of nonabelian representations of a knot group. It is known that if a knot is fibered, then the twisted Alexander polynomials associated with nonabelian SL(2,C)-representations are all monic. In this paper, we show that the converse holds for 2-bridge knots. Furthermore we show that for a 2-bridge knot there exists a curve component in the SL(2,C)-character variety such that if the knot is not fibered then there are only finitely many characters in the component for which the associated twisted Alexander polynomials are monic. We also show that for a 2-bridge knot of genus g, in the above curve component for all but finitely many characters the associated twisted Alexander polynomials have degree 4g-2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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