Arbitrarily large torsion in Khovanov cohomology

Sujoy Mukherjee
The Ohio State University, Columbus, USA
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Dirk Schütz
Durham University, UK

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Abstract

For any positive integer $k$ and $p \in {3, 5, 7}$ we construct a link which has a direct summand $Z / p^{k} Z$ in its Khovanov cohomology.

Sujoy Mukherjee, Dirk Schütz, Arbitrarily large torsion in Khovanov cohomology. Quantum Topol. 12 (2021), no. 2, pp. 243–264