Homological thickness and stability of torus knots

Details Homological thickness and stability of torus knots Homological thickness and stability of torus knots

2005-11-21

arxiv.org/abs/math/0511532v2

Mathematics

Geometric Topology

24 pages, expanded Section 6

Scientific paper

In this paper we show that the non-alternating torus knots are homologically thick, i.e. that their Khovanov homology occupies at least three diagonals. Furthermore, we show that we can reduce the number of full twists of the torus knot without changing certain part of its homology, and consequently, we show that there exists stable homology of torus knots conjectured by Dunfield, Gukov and Rasmussen in \cite{dgr}. Since our main tool is the long exact sequence in homology, we have applied our approach in the case of the Khovanov-Rozansky ($sl(n)$) homology, and thus obtained analogous stability properties of $sl(n)$ homology of torus knots, also conjectured in \cite{dgr}.

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