Reference : Differentials on graph complexes III: hairy graphs and deleting a vertex
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Mathematics
Differentials on graph complexes III: hairy graphs and deleting a vertex
Zivkovic, Marko mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Mathematics Research Unit >]
Letters in Mathematical Physics
Kluwer Academic Publishers
Yes (verified by ORBilu)
[en] Graph complexes ; Extra differential ; Hairy graph complexes ; Deleting a vertex
[en] We continue studying the cohomology of the hairy graph complexes which compute the rational homotopy of embedding spaces, generalizing the Vassiliev invariants of knot theory, after the second part in this series. In that part we have proven that the hairy graph complex HGC_{m,n} with the extra differential is almost acyclic for even m. In this paper, we give the expected same result for odd m. As in the previous part, our results yield a way to construct many hairy graph cohomology classes by the waterfall mechanism also for odd m. However, the techniques are quite different. The main tool used in this paper is a new differential, deleting a vertex in non-hairy Kontsevich’s graphs, and a similar map for hairy vertices. We hope that the new differential can have further applications in the study of Kontsevich’s graph cohomology. Namely it is conjectured that the Kontsevich’s graph complex with deleting a vertex as an extra differential is acyclic.
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