Mathematics – Geometric Topology
Scientific paper
2009-06-08
Mathematics
Geometric Topology
28 pages, 3 figures; v4: The direction of arrow was modified in the figure of figure eight knot, the explanation of local syst
Scientific paper
We study a computational method of the hyperbolic Reidemeister torsion (also called in the literature the non-abelian Reidemeister torsion) induced by J. Porti for complete hyperbolic three-dimensional manifolds with cusps. The derivative of the twisted Alexander invariant for a hyperbolic knot exterior gives the hyperbolic torsion. We prove such a derivative formula of the twisted Alexander invariant for hyperbolic link exteriors like the Whitehead link exterior. We provide the framework for the derivative formula to work, which consists of assumptions on the topology of the manifold and on the representations involved in the definition of the twisted Alexander invariant, and prove derivative formula in that context. We also explore the symmetry properties (with sign) of the twisted Alexander invariant and prove that it is in fact a polynomial invariant, like the usual Alexander polynomial.
Dubois Jérôme
Yamaguchi Yoshikazu
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