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arXiv 0903.1689math.GT
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与亚阿贝尔表示相关的2-桥纽结的扭曲Alexander多项式

Twisted Alexander polynomials of 2-bridge knots associated to metabelian representations

Mikami Hirasawa, Kunio Murasugi

摘要:

设纽结K的纽结群G(K)在A_4 \subset GL(4,Z)上有一个非交换表示ρ.我们猜想K的与ρ相联系的扭曲Alexander多项式的形式为:Δ_K(t)/(1-t)<$(t^3),其中Δ_K(t)是K的Alexander多项式,<$(t^3)是关于t^3的整数多项式。证明了关于群G(K)可映射到一个自由积Z/2*Z/3上的2-桥纽结K的猜想.随后,我们讨论了纽结群的更一般的亚阿贝尔表示,并提出了一个类似的猜想扭曲亚历山大多项式的形式。

英文摘要:

Suppose the knot group G(K) of a knot K has a non-abelian representation ρon A_4 \subset GL(4,Z). We conjecture that the twisted Alexander polynomial of K associated to ρis of the form: Δ_K(t)/(1-t) ϕ(t^3), where Δ_K (t) is the Alexander polynomial of K and ϕ(t^3) is an integer polynomial in t^3. We prove the conjecture for 2-bridge knots K whose group G(K) can be mapped onto a free product Z/2*Z/3. Later, we discuss more general metabelian representations of the knot groups and propose a similar conjecture on the form of the twisted Alexander polynomials.

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