The wild McKay correspondence conjecture for linear actions

Let D=SpecODD=\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 oX(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 VXV\to X is étale in codimension one, then

Mst(X)o=G-Cov(D)Lwdτ.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.

Sources & referencesView supporting material

Primary source

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

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