Semiorthogonal decomposition conjecture for Pfaffian linear sections

Let WW be a vector space of dimension 2n2n, let VΛ2WV\subset\Lambda^2W^* satisfy dimV=2n=dimW\dim V=2n=\dim W, and let VΛ2WV^\perp\subset\Lambda^2W be its orthogonal. Define the Pfaffian hypersurface linear section

YV=P(V)Pf(W)Y_V=\mathbb{P}(V)\cap\operatorname{Pf}(W^*)

and the dual Grassmannian linear section

XV=P(V)Gr(2,W).X_V=\mathbb{P}(V^\perp)\cap\operatorname{Gr}(2,W).

Let Y~V\widetilde{Y}_V be a categorical resolution of singularities of YVY_V. Pfaffian linear-section decomposition conjecture. The derived category of coherent sheaves on Y~V\widetilde{Y}_V has a semiorthogonal decomposition whose nontrivial component is equivalent to the derived category of XVX_V; more precisely,

Db(Y~V)=Db(XV),O,O(1),,O(n1).\mathcal{D}^b(\widetilde{Y}_V)=\langle \mathcal{D}^b(X_V),\mathcal{O},\mathcal{O}(1),\dots,\mathcal{O}(n-1)\rangle.

This is predicted by homological projective duality for the Grassmannian and Pfaffian hypersurface. In the supplied text it is explicitly deduced from the preceding conjecture, and no independent resolution status is given.

Sources & referencesView supporting material

Primary source

A. Kuznetsov, L. Manivel and D. Markushevich, “Abel-Jacobi maps for hypersurfaces and non commutative Calabi-Yau's”, arXiv:0806.1154 (2009).

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