循环空间的双曲性与旗域的自同构群
Hyperbolicity of cycle spaces and automorphism groups of flag domains
摘要:
若G_0是复半单李群G的实形式,Z是紧G-齐次射影代数流形,则G_0在Z上只有2个轨道。研究了开G_0-轨道D(旗域)的复解析性质.利用Schubert关联几何证明了某些循环空间分支C_q(D)的Kobayashi双曲性。利用C_q(D)的双曲性,通过分析Aut(D)对C_q(D)的作用,给出了Aut(D)的精确刻画.证明了,除了在容易理解的情况下,D是具有非平凡Remmert约化的全纯凸的,它是一个光滑地作用于D上的全纯变换群的李群.除了极少数例外,它只是G_0。
英文摘要:
If G_0 is a real form of a complex semisimple Lie group G and Z is compact G-homogeneous projective algebraic manifold, then G_0 has only finitely many orbits on Z. Complex analytic properties of open G_0-orbits D (flag domains) are studied. Schubert incidence-geometry is used to prove the Kobayashi hyperbolicity of certain cycle space components C_q(D). Using the hyperbolicity of C_q(D) and analyzing the action of Aut(D) on it, an exact description of Aut(D) is given. It is shown that, except in the easily understood case where D is holomorphically convex with a nontrivial Remmert reduction, it is a Lie group acting smoothly as a group of holomorphic transformations on D. With very few exceptions it is just G_0.
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