Connected-sum conjecture for powers of three in Khovanov torsion

Let T(2,3)T(2,3) denote the trefoil, let (σ1σ2σ3)4σ1σ2(\sigma_1\sigma_2\sigma_3)^4\sigma_1\sigma_2 denote the braid whose closure is used in the connected sum, and let #m\#_m denote the mm-fold connected sum operation. Connected-sum conjecture for powers of three. For every mZ+m\in\mathbb{Z}^{+}, the Khovanov homology of

T(2,3) #m (σ1σ2σ3)4σ1σ2T(2,3)\ \#_{m}\ (\sigma_1\sigma_2\sigma_3)^4\sigma_1\sigma_2

contains the torsion subgroups Z3,Z9,,Z3m\mathbb{Z}_3,\mathbb{Z}_9,\ldots,\mathbb{Z}_{3^m}.

The conjecture proposes an infinite family with torsion orders that are powers of 33 and was verified in the source up to m=4m=4; its general case remains open.

Sources & referencesView supporting material

Primary source

Sujoy Mukherjee, “On odd torsion in even Khovanov homology”, arXiv:1906.06278 (2019).

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