A domain in $\C^n$ with Levi-flat boundary near a given point is characterized in terms of the boundary behavior of the Kobayashi or Bergman metrics, or of the Bergman kernel. Some results are given in the case of intermediate values of the rank of the Levi form.
In this paper we studied a broader type of generalized balls which are domains on the complex projective with possibly Levi-degenerate boundaries. We proved rigidity theorems for proper holomorphic mappings among them by exploring the structure of the moduli spaces of projective linear subspaces, which generalized some earlier results for the ordinary generalized balls with Levi-nondegenerate boundaries.
Extremal Bases, Geometrically Separated Domains and Applications
本文在$\mathbb{C}^n$中引入了拟凸区域有限型边界点处切向量场极值基的概念。然后定义了在边界点上的几何分离域类,并给出了它们的复几何描述。例如,局部线性凸区域,具有局部可对角化Levi形式的区域,以及Levi形式在一点具有可比特征值的区域。此外,我们证明了这些域是局部化的。在此基础上,定义了“适应复下调和函数“的概念,并给出了它存在的充分条件。然后我们证明了Bergman ans Szegö投影的所有尖锐估计在这种情况下都是有效的。最后,我们将这些结果应用到例子中,得到全局和局部的尖锐估计,改进,例如,February man,Kohn和Machedon的Szegö投影的结果。
For a point $p$ in a smooth real hypersurface $M\subset\C^n$, where the Levi form has the nontrivial kernel $K^{10}_p$, we introduce an invariant cubic tensor $τ^3_p \colon \C T_p \times K^{10}_p \times \overline{K^{10}_p} \to \C\otimes (T_p/H_p)$, which together with Ebenfelt's tensor $ψ_3$, constitutes the full set of $3$rd order invariants of $M$ at $p$. Next, in addition, assume $M\subset\C^n$ to be {\em (weakly) pseudoconvex}. Then $τ^3_p$ must identically vanish. In this case we further define an invariant quartic tensor $τ^4_p \colon \C T_p \times \C T_p \times K^{10}_p\times \overline{…