Non injectivity of the "hair" map

Details Non injectivity of the "hair" map Non injectivity of the "hair" map

2002-02-07

arxiv.org/abs/math/0202065v3

Mathematics

Geometric Topology

4 pages

Scientific paper

Kricker constructed a knot invariant Z^{rat} valued in a space of Feynman diagrams with beads. When composed with the so called "hair" map H, it gives the Kontsevich integral of the knot. We introduce a new grading on diagrams with beads and use it to show that a non trivial element constructed from Vogel's zero divisor in the algebra \Lambda\ is in the kernel of H. This shows that H is not injective.

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