Gropes and the rational lift of the Kontsevich integral

Mathematics – Geometric Topology

Scientific paper

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Final version. To appear in "Knots in Poland" conference proceedings

Scientific paper

In this note, we calculate the leading term of the rational lift of the Kontsevich integral, introduced by Garoufalidis and Kricker, on the boundary of an embedded grope of class 2n. We observe that it lies in the subspace spanned by connected diagrams of Euler degree 2n-2 which have a bead t-1 on a single edge. This places severe algebraic restrictions on the sort of knots that can bound gropes, and in particular implies the two main results of the author's thesis, at least over the rationals.

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