Finite type invariants of cyclic branched covers

Details Finite type invariants of cyclic branched covers Finite type invariants of cyclic branched covers

2001-07-30

arxiv.org/abs/math/0107220v3

Mathematics

Geometric Topology

LaTeX, 28 pages with 22 figures

Scientific paper

Updated rerefences and introduction. Given a knot in an integer homology sphere, one can construct a family of closed 3-manifolds (parametrized by the positive integers), namely the cyclic branched coverings of the knot. In this paper we give a formula for the the Casson-Walker invariants of these 3-manifolds in terms of residues of a rational function (which measures the 2-loop part of the Kontsevich integral of a knot) and the signature function of the knot. Our main result actually computes the LMO invariant of cyclic branched covers in terms of a rational invariant of the knot and its signature function. Revised version.

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