paper

Surgery formulae for finite type invariants of rational homology 3--spheres

arXiv:math/0703347 · doi:10.2140/agt.2009.9.979

Abstract

We first present three graphic surgery formulae for the degree part of the Kontsevich-Kuperberg-Thurston universal finite type invariant of rational homology spheres. Each of these three formulae determines an alternate sum of the form where is the set of components of a framed algebraically split link in a rational homology sphere , and denotes the manifold resulting from the Dehn surgeries on the components of . The first formula treats the case when is a boundary link with components, while the second one is for --component algebraically split links. In the third formula, the link has components and the Milnor triple linking numbers of its 3--component sublinks vanish. The presented formulae are then applied to the study of the variation of under a -surgery on a knot . This variation is a degree polynomial in when the class of in $\QQ/\ZZ$ is fixed, and the coefficients of these polynomials are knot invariants, for which various topological properties or topological definitions are given.

51 pages, uses pstricks

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