Parabolic Subgroups of Real Direct Limit Groups

Details Parabolic Subgroups of Real Direct Limit Groups Parabolic Subgroups of Real Direct Limit Groups

2009-01-02

arxiv.org/abs/0901.0295v1

Contemp. Math. 499 (2009) 47-59

Mathematics

Representation Theory

13 pages

Scientific paper

Let $G_R$ be a classical real direct limit Lie group and $g_R$ its Lie algebra. The parabolic subalgebras of the complexification $g_C$ were described by the first two authors. In the present paper we extend these results to $g_R$. This also gives a description of the parabolic subgroups of $G_R$. Furthermore, we give a geometric criterion for a parabolic subgroup $P_C$ of $G_C$ to intersect $G_R$ in a parabolic subgroup. This criterion involves the $G_R$-orbit structure of the flag ind-manifold $G_C/P_C$.

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