Polishchuk–Vandenberghe conjecture on semiorthogonal decompositions of equivariant derived categories

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Let XX be a smooth variety over an algebraically closed field of characteristic zero, and let a finite group GG act effectively on XX. For λ∈G/∼\lambda\in G/{\sim}, let XλX_\lambda be the invariant subvariety of λ\lambda, let C(λ)C(\lambda) be its centralizer, and suppose that each geometric quotient Xλ/C(λ)X_\lambda/C(\lambda) is smooth. The pieces below are indexed by the conjugacy classes of GG. Polishchuk–Vandenberghe conjecture. There should be a semiorthogonal decomposition of the derived category D[X/G]\mathcal{D}[X/G] whose pieces C[λ]\mathcal{C}_{[\lambda]} satisfy

C[λ]≅D(Xλ/C(λ)).\mathcal{C}_{[\lambda]}\cong \mathcal{D}(X_\lambda/C(\lambda)).

This conjecture asks whether the Hochschild-homology decomposition indexed by conjugacy classes can be lifted to the level of derived categories. The source presents it as a natural question in the setting where all the geometric quotients are smooth; the supplied text gives no resolution, so its status remains open.

References

Primary source

Bronson Lim and Alexander Polishchuk, “Semiorthogonal decompositions of equivariant derived categories of invariant divisors”, arXiv:1709.10450 (2019).

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