Finiteness of a section of the $SL(2,\mathbb{C})$-character variety of knot groups

Details Finiteness of a section of the $SL(2,\mathbb{C})$-character variety of knot groups Finiteness of a section of the $SL(2,\mathbb{C})$-character variety of knot groups

2006-10-10

arxiv.org/abs/math/0610310v1

Mathematics

Geometric Topology

9 pages

Scientific paper

We show that for any knot there exist only finitely many irreducible metabelian characters in the $SL(2,\mathbb{C})$-character variety of the knot group, and the number is given explicitly by using the determinant of the knot. Then it turns out that for any 2-bridge knot a section of the $SL(2,\mathbb{C})$-character variety consists entirely of all the metabelian characters, i.e., the irreducible metabelian characters and the single reducible (abelian) character. Moreover we find that the number of irreducible metabelian characters gives an upper bound of the maximal degree of the A-polynomial in terms of the variable $l$.

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