Derived equivalence conjecture for the Lehn–Lehn–Sorger–van Straten eightfold

Let YY be a cubic fourfold, let ZZ be its associated symplectic eightfold, and suppose that YCdY\in\mathcal C_d for some dd satisfying the relevant condition. Then ZZ is isomorphic to a moduli space of Bridgeland-stable complexes on a K3 surface SS. Let αBr(Z)\alpha\in\operatorname{Br}(Z) be the obstruction to the existence of a universal complex on Z×SZ\times S, and let UDb(Z×S,α1)U\in D^b(Z\times S,\alpha\boxtimes 1) be a twisted universal complex. Since YY is naturally embedded in ZZ and Br(Y)=0\operatorname{Br}(Y)=0, the restriction UY×SU|_{Y\times S} can be untwisted. Derived equivalence conjecture. The functor ADb(S)\mathcal A\to D^b(S) induced by UY×SU|_{Y\times S} is an equivalence. This is an approach to proving that the Kuznetsov component A\mathcal A of the cubic fourfold is equivalent to the derived category of a K3 surface under the stated discriminant condition; the parser supplied no evidence resolving this conjecture.

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Primary source

Nicolas Addington and Franco Giovenzana, “On the period of Lehn, Lehn, Sorger, and van Straten's symplectic eightfold”, arXiv:2003.10984 (2021).

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