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极化完备的左不变联络

Polarization complete left invariant connections

Balázs Forman, Róbert Szőke

arXiv 2609.15673首次发表:更新:

发表机构

ELTE - Eötvös L. Univ.(罗兰大学)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本文研究实解析 Koszul 流形上的适配复结构与 ac-极化,利用推广的极映射证明许多非整联络是极化完备的。

AI 中文摘要

设 $(M,\nabla)$ 为实解析 Koszul 流形。在 $TM$ 的零截面邻域 $N$ 上的适配复结构(ac-结构)是 $N$ 上的一个复结构,使得 Levi-Civita 叶理的叶子为全纯曲线。更一般地,$N$ 上的复极化 $P$ 被称为 ac-极化,如果 Levi-Civita 叶理的叶子与 $P$ 相切。ac-结构的 (1,0) 切向量丛是 ac-极化。该联络被称为整的(或极化完备的,或简称为 $\mathcal P$-完备的),如果 ac-结构(或 ac-极化)存在于 $TM$ 上。尽管在足够小的 $N$ 上 ac-结构总是存在,整联络是罕见的,并且如果 ac-结构的最大定义域 $N_{max}$ 存在(不同于 $TM$),则 $N_{max}$ 是一个复杂的区域。另一方面,在许多情况下,相关的 ac-极化可以扩展到整个 $TM$。本文的主要目的是利用极映射的推广版本更好地理解这一现象。作为特例,我们证明了 Aslam-Burns-Irvine 和 Halverscheid-Iannuzzi 研究的许多度量虽然不是整的,但是 $\mathcal P$-完备的。

英文摘要

Let $(M,\nabla)$ be a real analytic Koszul manifold. An adapted complex structure (ac-structure) on a neighborhood $N$ of the zero section in $TM$ is a complex structure on $N$ such that the leaves of the Levi-Civita foliation are holomorphic curves. More generally, a complex polarization $P$ on $N$ is called an ac-polarization if the leaves of the Levi-Civita foliation are tangential to $P$. The bundle of (1,0) tangent vectors of an ac-structure is an ac-polarization. The connection is called entire (resp. polarization complete or simply $\mathcal P$-complete) if the ac-structure (resp. the ac-polarization) exists on $TM$. Although on a small enough $N$ an ac-structure always exists, entire connections are rear and if a maximal domain of definition $N_{max}$ of an ac-structure exists (different from $TM$), $N_{max}$ is a complicated domain. On the other hand in many cases the associated ac-polarization can be extended to the whole $TM$. The main purpose of the paper is to gain better understanding of this phenomenon using a generalized version of the polar map. As special cases we show that many of those metrics studied by Aslam-Burns-Irvine and Halverscheid-Iannuzzi although are not entire but are $\mathcal P$-complete.

Comments56 pages

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