Homogeneous domains on flag manifolds (Q1095416)

The paper is concerned with the study of the following problem: for a parabolic subgroup P of a (complex or real) semisimple Lie group L find all subgroups \(G\subset L\) which act locally transitively on the flag manifold L/P and find all open orbits of these subgroups on L/P. The author solves this problem in the following cases: L is a real simple Lie group of real rank 1; L is a complex simple Lie group, P its maximal parabolic subgroup; L is a real pseudoorthogonal group, L/P the corresponding quadric, G reductive. A characterization of locally transitive subgroups \(G\subset L\) in terms of representation theory is established. The paper also contains a survey of related results and applications.