Duality compatibility for Fukaya-category cobordism cone decompositions

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Let WW be a Lagrangian cobordism with ends L1,…,LsL_1,\ldots,L_s and associated paths γ1,…,γs\gamma_1,\ldots,\gamma_s. Let F\mathcal{F} be the Fukaya category, let MW,γjl\mathcal{M}_{W,\gamma_j}^l and MW,γjr,rel\mathcal{M}_{W,\gamma_j}^{r,\mathit{rel}} be the associated left and relative right F\mathcal{F}-modules, and let (⋅)∨(\cdot)^\vee denote the dual module. Write δW,j\delta_{W,j} for the quasi-isomorphisms induced by the relative weak Calabi--Yau pairing, and let νj\nu_j and ξj\xi_j be the morphisms in the left-module and dual right-module exact triangles.

Duality compatibility conjecture. For j=1,…,s−1j=1,\ldots,s-1, the quasi-isomorphisms

δW,j:=(Iγj)∗(δ0Fc)W:MW,γjl→(MW,γj−1r,rel)∨\delta_{W,j}:=(\mathbf{I}_{\gamma_j})^*(\delta_0^{\mathcal{F}_c})_W:\mathcal{M}_{W,\gamma_j}^l\to (\mathcal{M}_{W,\gamma_{j-1}}^{r,\mathit{rel}})^\vee

have the stated compatibility properties: δW,1=(δ0F)L1\delta_{W,1}=(\delta^\mathcal{F}_0)_{L_1}; for j=2,…,s−1j=2,\ldots,s-1, the diagrams comparing the left-module exact triangles with the duals of the right-module exact triangles commute in F−−mod⁡\mathcal{F}\mathit{--}\operatorname{mod} up to homotopy of module morphisms; and the analogous final diagram for LsL_s also commutes up to homotopy. Consequently, the induced diagrams commute in the derived category D(F)D(\mathcal{F}).

The conjecture predicts that the relative weak Calabi--Yau duality pairing is compatible with the cone decompositions associated to a Lagrangian cobordism. The paper states this expected comparison but does not carry out its details, so the compatibility remains open.

References

Primary source

Emily Campling, “Fukaya categories of Lagrangian cobordisms and duality”, arXiv:1902.00930 (2019).

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