The wild McKay correspondence conjecture for linear actions

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Let D=Spec⁡ODD=\operatorname{Spec}\mathcal{O}_{D}, where OD\mathcal{O}_{D} is a complete discrete valuation ring with algebraically closed residue field kk. Let V=ADdV=\mathbb{A}_{D}^{d} carry a linear action of a finite group GG, and set X:=V/GX:=V/G. Let o∈X(k)o\in X(k) be the image of the origin, let Mst(X)oM_{\mathrm{st}}(X)_{o} be the stringy motif at oo, and let G-Cov(D)G\text{-}\mathrm{Cov}(D) denote the conjectural moduli space of GG-covers of DD. Let w\mathbf{w} be the weight function associated to the representation VV, and let τ\tau be the tautological motivic measure.

The wild McKay correspondence conjecture. If the quotient morphism V→XV\to X is étale in codimension one, then

Mst(X)o=∫G-Cov(D)Lw dτ.M_{\mathrm{st}}(X)_{o}=\int_{G\text{-}\mathrm{Cov}(D)}\mathbb{L}^{\mathbf{w}}\,d\tau.

This is the stringy-invariant formulation of the wild McKay correspondence, extending the characteristic-zero and tame cases to arbitrary characteristics. The moduli space and motivic integral are conjectural, and the formula is known only in special cases.

References

Primary source

Takehiko Yasuda, “Wilder McKay correspondences”, arXiv:1404.3373 (2014).

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