568 research outputs found
Moduli space of CR-projective complex foliated tori
We study the moduli space of CR-projective complex foliated tori. We describe
it in terms of isotropic subspaces of Grassmannian and we show that it is a
normal complex analytic space
On homogeneous CR manifolds and their CR algebras
In this paper we show some results on homogeneous CR manifolds, proved by
introducing their associated CR algebras. In particular, we give different
notions of nondegeneracy (generalizing the usual notion for the Levi form)
which correspond to geometrical properties for the corresponding manifolds. We
also give distinguished equivariant CR fibrations for homogeneous CR manifolds.
In the second part of the paper we apply these results to minimal orbits for
the action of a real form of a semisimple Lie group \^G on a flag manifold
\^G/Q.Comment: 14 pages. AMS-LaTeX v2: minor revisio
The CR structure of minimal orbits in complex flag manifolds
Let \^G be a complex semisimple Lie group, Q a parabolic subgroup and G a
real form of \^G. The flag manifold \^G/Q decomposes into finitely many
G-orbits; among them there is exactly one orbit of minimal dimension, which is
compact. We study these minimal orbits from the point of view of CR geometry.
In particular we characterize those minimal orbits that are of finite type and
satisfy various nondegeneracy conditions, compute their fundamental group and
describe the space of their global CR functions. Our main tool are parabolic CR
algebras, which give an infinitesimal description of the CR structure of
minimal orbits.Comment: AMS-TeX, 44 pages v2: minor revisio
On the topology of minimal orbits in complex flag manifolds
We compute the Euler-Poincar\'e characteristic of the homogeneous compact
manifolds that can be described as minimal orbits for the action of a real form
in a complex flag manifold.Comment: 21 pages v2: Major revisio
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