Motivic hyper-Kähler resolution conjecture

Let MM be a smooth projective holomorphic symplectic variety endowed with a faithful symplectic action of a finite group GG. Let X:=M/GX:=M/G be the quotient, and suppose that XX has a crepant resolution YXY\to X. Let CHMC\operatorname{CHM}_{\mathbf C} denote the category of complex Chow motives, and write h(Y)\mathfrak h(Y) and horb([M/G])\mathfrak h_{orb}([M/G]) for the ordinary and orbifold Chow motives. Motivic hyper-Kähler resolution conjecture. There is an isomorphism of algebra objects in CHMC\operatorname{CHM}_{\mathbf C}:

h(Y)horb([M/G]).\mathfrak h(Y)\simeq\mathfrak h_{orb}([M/G]).

In particular, there is an isomorphism of graded C\mathbf C-algebras

CH(Y)CCHorb([M/G])C.\operatorname{CH}^{*}(Y)_{\mathbf C}\simeq\operatorname{CH}^{*}_{orb}([M/G])_{\mathbf C}.

The conjecture was proposed in the cited work and is proven for Hilbert schemes of abelian varieties, generalized Kummer varieties, and Hilbert schemes of K3 surfaces, so it is solved in the stated generality by the cited results.

Sources & referencesView supporting material

Primary source

Lie Fu and Zhiyu Tian, “Motivic multiplicative McKay correspondence for surfaces”, arXiv:1709.01714 (2018).

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