Quotients by actions of the derived group of a maximal unipotent subgroup

Details Quotients by actions of the derived group of a maximal unipotent subgroup Quotients by actions of the derived group of a maximal unipotent subgroup

2010-09-21

arxiv.org/abs/1009.4051v2

Mathematics

Algebraic Geometry

23 pages

Scientific paper

Let $U$ be a maximal unipotent subgroup of a connected semisimple group $G$ and $U'$ the derived group of $U$. If $X$ is an affine $G$-variety, then the algebra of $U'$-invariants, $k[X]^U'$, is finitely generated and the quotient morphism $\pi: X \to X//U'$ is well-defined. In this article, we study properties of such quotient morphisms, e.g. the property that all the fibres of $\pi$ are equidimensional. We also establish an analogue of the Hilbert-Mumford criterion for the null-cones with respect to $U'$-invariants.

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