Crepant categorical resolution conjecture for the Coble cubic

Let CC be the singular Coble cubic, let WW be the associated smooth variety, let qWq^*W be its indicated P1\mathbb{P}^1-bundle, and let Γ\Gamma be the associated genus-22 curve. Coble-cubic categorical-resolution conjecture. There should exist functors Ψi:Db(Γ)Db(qW)\Psi_i:\operatorname{D}^b(\Gamma)\to\operatorname{D}^b(q^*W) for i=1,2,3i=1,2,3 and exceptional objects EjE_j for j=1,,6j=1,\ldots,6 such that

C~=Ψ1Db(Γ),E1,E2,Ψ2Db(Γ),E3,E4,Ψ3Db(Γ),E5,E6\widetilde{\mathsf{C}}=\langle\Psi_1\operatorname{D}^b(\Gamma),E_1,E_2,\Psi_2\operatorname{D}^b(\Gamma),E_3,E_4,\Psi_3\operatorname{D}^b(\Gamma),E_5,E_6\rangle

is a crepant categorical resolution of singularities of CC. This proposal is motivated by the expected decomposition of qWq^*W into two copies of the derived category of CC and two copies of the category of its singular locus; the source provides no proof.

Sources & referencesView supporting material

Primary source

Marcello Bernardara, Enrico Fatighenti and Laurent Manivel, “Nested varieties of K3 type”, arXiv:1912.03144 (2019).

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