MOTIVIC MULTIPLICATIVE MCKAY CORRESPONDENCE FOR SURFACES

We revisit the classical 2-dimensional McKay correspondence in two respects: First, which is the main point of this work, we take into account of the multiplicative structure given by the orbifold product; second, instead of using cohomology, we deal with the Chow motives. More precisely, we prove that for any smooth proper 2-dimensional orbifold with projective coarse moduli space, there is an isomorphism of algebra objects, in the category of complex Chow motives, between the motive of the minimal resolution and the orbifold motive. In particular, the complex Chow ring (resp. Grothendieck ring, cohomology ring) of the minimal resolution is isomorphic to the complex orbifold Chow ring (resp. Grothendieck ring, cohomology ring) of the orbifold surface. This confirms the two-dimensional Motivic Crepant Resolution Conjecture