Symmetric-group action conjecture for Heegaard Floer link homology

Let TnS3T_n\subset S^3 be the (n,n)(n,n)-torus link. Fix a Heegaard diagram D1=(Σ,α,β,z1,,zn,w1,,wn)\mathcal{D}_1=(\Sigma,\mathbf{\alpha},\mathbf{\beta},z_1,\dots,z_n,w_1,\dots,w_n) and a permutation σSn\sigma\in S_n, and let D2\mathcal{D}_2 be obtained by permuting the basepoints according to σ\sigma. Let Fσ:HFL^(D1)HFL^(D2)F_\sigma:\widehat{HFL}(\mathcal{D}_1)\to\widehat{HFL}(\mathcal{D}_2) be the graded isomorphism induced by chosen diagram moves, and let Gσ:HFL^(D2)HFL^(D1)G_\sigma:\widehat{HFL}(\mathcal{D}_2)\to\widehat{HFL}(\mathcal{D}_1) be the canonical isomorphism induced by identifying intersection points. Symmetric-group action conjecture. The map

σGσFσAut(HFL^(D1))\sigma\longmapsto G_\sigma\circ F_\sigma\in\operatorname{Aut}\bigl(\widehat{HFL}(\mathcal{D}_1)\bigr)

defines a representation of SnS_n on HFL^(D1)\widehat{HFL}(\mathcal{D}_1). The conjecture seeks a coherent symmetric-group action from component-permuting isotopies; identifying the resulting representation, and controlling its dependence on the chosen diagram moves, remains open.

Sources & referencesView supporting material

Primary source

Joan E. Licata, “Heegaard Floer homology of (n,n)-torus links: computations and questions”, arXiv:1208.0394 (2012).

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