McKay correspondence over non algebraically closed fields

Details McKay correspondence over non algebraically closed fields McKay correspondence over non algebraically closed fields

2006-01-23

arxiv.org/abs/math/0601550v3

Mathematics

Algebraic Geometry

24 pages; revised, partly shortened and partly details added

Scientific paper

The classical McKay correspondence for finite subgroups $G$ of $\SL(2,\C)$ gives a bijection between isomorphism classes of nontrivial irreducible representations of $G$ and irreducible components of the exceptional divisor in the minimal resolution of the quotient singularity $\A^2_\C/G$. Over non algebraically closed fields $K$ there may exist representations irreducible over $K$ which split over $\bar{K}$. The same is true for irreducible components of the exceptional divisor. In this paper we show that these two phenomena are related and that there is a bijection between nontrivial irreducible representations and irreducible components of the exceptional divisor over non algebraically closed fields $K$ of characteristic 0 as well.

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