Affine spherical homogeneous spaces with good quotient by a maximal unipotent subgroup

preprint2013arXivOpen access

Abstract

For an affine spherical homogeneous space G/H of a connected semisimple algebraic group G, we consider the factorization morphism by the action on G/H of a maximal unipotent subgroup of G. We prove that this morphism is equidimensional if and only if the weight semigroup of G/H satisfies some simple condition.

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