The motivic McKay correspondence for linear actions II

Let X\mathfrak{X} and V\mathfrak{V} be the centered log structures associated with X=V/GX=V/G and the linear GG-variety VV. For a GG-cover EDE\to D with connected component FF and stabilizer HH, let VF\mathfrak{V}^{|F|} be the associated centered log structure and let CG(H)C_G(H) act on it. Let τ\tau be the tautological motivic measure on G-Cov(D)G\text{-}\mathrm{Cov}(D).

The motivic McKay correspondence for linear actions II. We have

Mst(X)=G-Cov(D)Mst,CG(H)(VF)dτ.M_{\mathrm{st}}(\mathfrak{X})=\int_{G\text{-}\mathrm{Cov}(D)}M_{\mathrm{st},C_G(H)}(\mathfrak{V}^{|F|})\,d\tau.

This is the decomposition of the orbifold stringy motif into contributions from GG-covers and is a reformulation of the first linear motivic McKay conjecture. Its validity depends on the preceding conjectural change-of-variables statements, and the source gives no resolution.

Sources & referencesView supporting material

Primary source

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

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