|Time||Jan 11 16:20~16:40|
|Title||On a topological interpretation of quandle cocycle invariants of classical links.|
S. Cater and M. Saito et al. introduced quandle cocycle invariants of classical links using quandle 2-cocycles with local coefficients. However the construction is combinatorially by using link-diagrams. In this talk, for ``some'' quandles, we give a topological interpretation of all the quandle cocycle invariants. Precisely, the cocycle invariant is a linear sum of ``colouring polynomial'' introduced by M. Eisermann and of a certain part of the Dijkgraaf-Witten invariant.