2016•International Mathematics Research NoticesOpen access

Stabilization of the Khovanov Homotopy Type of Torus Links

Michael Willis

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Abstract

The structure of the Khovanov homology of |$(n,m)$| torus links has been studied extensively. In particular, Marko Stošić proved that the homology groups stabilize as |$m\rightarrow\infty$|⁠. We show that the Khovanov homotopy types of |$(n,m)$| torus links, as constructed by Robert Lipshitz and Sucharit Sarkar, also become stably homotopy equivalent as |$m\rightarrow\infty$|⁠. We provide an explicit bound on values of |$m$| beyond which the stabilization begins. As an application, we give new examples of torus links with non-trivial |$Sq^2$| action.

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The structure of the Khovanov homology of |$(n,m)$| torus links has been studied extensively. In particular, Marko Stošić proved that the homology groups stabilize as |$m\rightarrow\infty$|⁠. We show that the Khovanov homotopy types of |$(n,m)$| torus links, as constructed by Robert Lipshitz and Sucharit Sarkar, also become stably homotopy equivalent as |$m\rightarrow\infty$|⁠. We provide an explicit bound on values of |$m$| beyond which the stabilization begins. As an application, we give new examples of torus links with non-trivial |$Sq^2$| action.

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Available abstract

The structure of the Khovanov homology of |$(n,m)$| torus links has been studied extensively. In particular, Marko Stošić proved that the homology groups stabilize as |$m\rightarrow\infty$|⁠. We show that the Khovanov homotopy types of |$(n,m)$| torus links, as constructed by Robert Lipshitz and Sucharit Sarkar, also become stably homotopy equivalent as |$m\rightarrow\infty$|⁠. We provide an explicit bound on values of |$m$| beyond which the stabilization begins. As an application, we give new examples of torus links with non-trivial |$Sq^2$| action.

Key concepts: Torus, Khovanov homology, Homotopy, Mathematics, Homology (biology), Type (biology), Pure mathematics, Combinatorics

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