Homogeneous Kähler and Hamiltonian manifolds

Details Homogeneous Kähler and Hamiltonian manifolds Homogeneous Kähler and Hamiltonian manifolds

2010-01-08

arxiv.org/abs/1001.1209v2

Mathematics

Complex Variables

12 pages. The statement of Theorem 3.5 has been improved

Scientific paper

We consider actions of reductive complex Lie groups $G=K^C$ on K\"ahler manifolds $X$ such that the $K$--action is Hamiltonian and prove then that the closures of the $G$--orbits are complex-analytic in $X$. This is used to characterize reductive homogeneous K\"ahler manifolds in terms of their isotropy subgroups. Moreover we show that such manifolds admit $K$--moment maps if and only if their isotropy groups are algebraic.

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