Prasad–Saeki braid conjecture for torsion in Khovanov homology

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Consider the Khovanov homology of closures of braids, where pp is prime and rr is a positive integer.

Prasad–Saeki braid conjecture. The Khovanov homology of a closed 33-braid can have only Z2\mathbb{Z}_2-torsion. The Khovanov homology of a closed 44-braid cannot have odd torsion, and can have only Z2\mathbb{Z}_2- and Z4\mathbb{Z}_4-torsion. More generally, the Khovanov homology of a closed nn-braid cannot have pp-torsion for p>np>n, and cannot have Zpr\mathbb{Z}_{p^r}-torsion for pr>np^r>n.

The paper introduces counterexamples to parts (2') and (3') for p=2p=2, so the listed claim is refuted at least in those parts. The status of the remaining parts is not resolved by the supplied excerpt.

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Primary source

Sujoy Mukherjee, Józef H. Przytycki, Marithania Silvero, Xiao Wang and Seung Yeop Yang, “Search for torsion in Khovanov homology”, arXiv:1701.04924 (2017).

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