Polishchuk–Vandenberghe conjecture on semiorthogonal decompositions of equivariant derived categories
Let be a smooth variety over an algebraically closed field of characteristic zero, and let a finite group act effectively on . For , let be the invariant subvariety of , let be its centralizer, and suppose that each geometric quotient is smooth. The pieces below are indexed by the conjugacy classes of . Polishchuk–Vandenberghe conjecture. There should be a semiorthogonal decomposition of the derived category whose pieces satisfy
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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