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- Title
TWISTED ALEXANDER POLYNOMIALS AND CHARACTER VARIETIES OF 2-BRIDGE KNOT GROUPS.
- Authors
KIM, TAEHEE; MORIFUJI, TAKAYUKI
- Abstract
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 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.
- Subjects
ALGEBRAIC varieties; POLYNOMIALS; KNOT theory; NONABELIAN groups; ALGEBRAIC curves; REPRESENTATIONS of algebras; TOPOLOGICAL degree
- Publication
International Journal of Mathematics, 2012, Vol 23, Issue 6, p1250022-1
- ISSN
0129-167X
- Publication type
Article
- DOI
10.1142/S0129167X11007653