Duality compatibility for Fukaya-category cobordism cone decompositions

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,,s1j=1,\ldots,s-1, the quasi-isomorphisms

δW,j:=(Iγj)(δ0Fc)W:MW,γjl(MW,γj1r,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,,s1j=2,\ldots,s-1, the diagrams comparing the left-module exact triangles with the duals of the right-module exact triangles commute in Fmod\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.

Sources & referencesView supporting material

Primary source

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

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