Stein manifolds and multiplicity-free representations of compact Lie groups

Details Stein manifolds and multiplicity-free representations of compact Lie groups Stein manifolds and multiplicity-free representations of compact Lie groups

2010-04-25

arxiv.org/abs/1004.4381v1

Contemporary Mathematics, vol. 554 (2011), 1 - 12

Mathematics

Representation Theory

Scientific paper

The paper is a survey of recent results in geometric representation theory describing group actions which induce multiplicity-free representations in the spaces of holomorphic functions. For connected compact Lie groups of automorphisms of Stein manifolds we characterize such actions in terms of antiholomorphic involutions. Some proofs are given and some results are new. For example, spherical complex spaces are defined for arbitrary real forms of complex reductive groups. Their properties, which we prove here, were known only for compact real forms. We also show that a complex compact homogeneous manifold of a complex reductive group is spherical if and only if the fiber of its Tits fibration is a complex torus.

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