Kuznetsov's categorical McKay conjecture for quotient singularities

From papers

Let VV be a smooth quasi-projective variety, and let GG be a finite subgroup of Aut(V)\operatorname{Aut}(V) such that ωV\omega_V is GG-equivariantly locally trivial. Let ZV/GZ\to V/G be any resolution of singularities. Kuznetsov's conjecture. There exists an admissible fully faithful embedding

Db(CohG(V))Db(Z).\mathrm{D}^b(\operatorname{Coh}^G(V))\hookrightarrow \mathrm{D}^b(Z).

In particular, if ZZ is a crepant resolution of V/GV/G, there is an equivalence

Db(CohG(V))Db(Z).\mathrm{D}^b(\operatorname{Coh}^G(V))\simeq\mathrm{D}^b(Z).

This is the stated categorical form of the McKay correspondence for quotient singularities. The last equivalence is known when dimV3\dim V\leq 3, or when VV is symplectic and GG acts by symplectic automorphisms; the general assertion remains open.

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Sources & referencesView supporting material

Primary source

Roland Abuaf, “Categorical crepant resolutions for quotient singularities”, arXiv:1406.4409 (2014).

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