A reductive group with finitely generated cohomology algebras

Abstract

Let $G$ be the linear algebraic group $S{L}_3$ over a field $k$ of characteristic two. Let $A$ be a finitely generated commutative $k$-algebra on which $G$ acts rationally by $k$-algebra automorphisms. We show that the full cohomology ring $H^{\ast }(G,A)$ is finitely generated. This extends the finite generation property of the ring of invariants $A^G$. We discuss where the problem stands for other geometrically reductive group schemes.

16 pages; minor changes; final version

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