Universal family of the subgroups of an algebraic group

Details Universal family of the subgroups of an algebraic group Universal family of the subgroups of an algebraic group

2010-05-05

arxiv.org/abs/1005.0748v1

Mathematics

Group Theory

18 pages

Scientific paper

We construct a moduli space for the connected subgroups of an algebraic group and the corresponding universal family. Morphisms from an algebraic variety to this moduli space correspond to flat families of connected algebraic subgroups parametrised by this variety. This moduli space is obtained by gluing together infinitely many irreducible projective varieties of bounded dimension along closed subvarieties. Regarding families of non-connected subgroups of an algebraic group, we show that, given sich a family, the corresponding family of identity components is an irreducible component of the former, and the quotient of a family of groups group by the family of their identity components exists.

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