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A flag domain is an open real group orbit in a complex flag manifold. It has been shown that a flag domain is either pseudoconvex or pseudoconcave. Moreover, generically 1-connected flag domains are pseudoconcave. In this study, for flag…

Complex Variables · Mathematics 2022-12-29 Tatsuki Hayama

In this paper we study domains in flag manifolds which are bounded in an affine chart and whose projective automorphism group acts co-compactly. In contrast to the many examples in real projective space, we will show that no examples exist…

Differential Geometry · Mathematics 2018-01-26 Andrew Zimmer

A flag domain $D$ is an open orbit of a real form $G_0$ in a flag manifold $Z=G/P$ of its complexification. If $D$ is holomorphically convex, then, since it is a product of a Hermitian symmetric space of bounded type and a compact flag…

Complex Variables · Mathematics 2014-03-21 Alan Huckleberry

A flag domain of a real from $G_0$ of a complex semismiple Lie group $G$ is an open $G_0$-orbit $D$ in a (compact) $G$-flag manifold. In the usual way one reduces to the case where $G_0$ is simple. It is known that if $D$ possesses…

Complex Variables · Mathematics 2018-07-20 T. Hayama , A. Huckleberry , Q. Latif

Flag domains are open orbits of real semisimple Lie groups in flag manifolds of their complexification. A special class of flag domains constitute the classifying spaces for variations of Hodge structure, namely period domains or more…

Algebraic Geometry · Mathematics 2016-06-16 Ana-Maria Brecan

A flag manifold over a semifield K can be partitioned into "half i-circles" which are orbits of a K-action on that flag manifold. Here i is fixed and it corresponds to a simple reflection in the Weyl group. We prove (for certain K) a…

Representation Theory · Mathematics 2022-12-21 G. Lusztig

Flag domains are open orbits of real semisimple Lie groups in flag manifolds of their complexifications. Certain group theoretically defined compact complex submanifolds, which are regarded as cycles, are of basic importance for their…

Algebraic Geometry · Mathematics 2014-11-04 Ana-Maria Brecan

The boundary of every relatively compact Stein domain in a complex manifold of dimension at least two is connected. No assumptions on the boundary regularity are necessary. The same proofs hold also for $q$-complete domains, and in the…

Complex Variables · Mathematics 2024-07-17 Rafael B. Andrist

Flag domains are open orbits of noncompact real forms of complex semisimple Lie groups acting on flag manifolds. To each flag domain one can associate a compact complex manifold called the base cycle. The ampleness of the normal bundle of…

Complex Variables · Mathematics 2023-10-26 Jaehyun Hong , Aeryeong Seo

We study actions of discrete subgroups $\Gamma$ of semi-simple Lie groups $G$ on associated oriented flag manifolds. These are quotients $G/P$, where the subgroup $P$ lies between a parabolic subgroup and its identity component. For Anosov…

Differential Geometry · Mathematics 2018-06-13 Florian Stecker , Nicolaus Treib

Flag domains are open orbits of real forms $G_\mathbb{R}$ of complex reductive Lie supergroups $G$ in $G$-flag supermanifolds $Z = G/P$. This thesis discusses three topics from the theory of these flag domains: 1. Measurability(i.e.…

Representation Theory · Mathematics 2015-07-16 Christopher Graw

Let $p:X\longrightarrow M$ be a Riemann domain over a connected $n$-dimensional complex submanifold $M$ of $\mathbb C^N$ and let $\mathcal F\subset\mathcal O(X)$ be such that $p\in\mathcal F^N$. Our aim is to discuss relations between the…

Complex Variables · Mathematics 2013-10-01 Marek Jarnicki , Peter Pflug

We show that if a bounded domain in complex Euclidean space with $\mathcal{C}^{1,1}$ boundary covers a compact manifold, then the domain is biholomorphic to the unit ball.

Complex Variables · Mathematics 2019-12-03 Andrew Zimmer

In this paper we analyze the problem of the geodesic connectedness of subsets of Riemannian manifolds. By using variational methods, the geodesic connectedness of open domains (whose boundaries can be not differentiable and not convex) of a…

Differential Geometry · Mathematics 2014-01-21 Rossella Bartolo , Anna Germinario , Miguel Sanchez

We consider complex manifolds that admit actions by holomorphic transformations of classical simple real Lie groups and classify all such manifolds in a natural situation. Under our assumptions, which require the group at hand to be…

Complex Variables · Mathematics 2009-01-28 Alan Huckleberry , Alexander Isaev

This is a survey of history, methods and developments in the theory of cycle spaces of flag domains, and new results on double fibration transforms and their applications.

Representation Theory · Mathematics 2007-05-23 Alan T. Huckleberry , Joseph A. Wolf

This is an example on the cohomology of threefolds.

Algebraic Geometry · Mathematics 2017-10-03 B. Wang

In this paper we find big Euclidean domains in complex manifolds. We consider open neighbourhoods of sets of the form $K\cup M$ in a complex manifold $X$, where $K$ is a compact $\mathscr O(U)$-convex set in an open Stein neighbourhood $U$…

Complex Variables · Mathematics 2022-01-13 Franc Forstneric

In this article, we give completely new examples of embedded complex manifolds the germ of neighborhood of which is holomorphically equivalent to a germ of neighborhood of the zero section in its normal bundle. The first set of examples is…

Complex Variables · Mathematics 2025-10-31 Laurent Stolovitch , Xiaojun Wu

We give a necessary and sufficient condition for two real flag manifolds, which are not necessarily congruent, in a complex flag manifold to intersect transversally in terms of the symmetric triad. Then we show that the intersection of two…

Differential Geometry · Mathematics 2025-07-18 Osamu Ikawa , Hiroshi Iriyeh , Takayuki Okuda , Takashi Sakai , Hiroyuki Tasaki
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