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arXiv 0903.3485math.DSmath.CV
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亚纯联络与齐次向量场的庞加莱-本迪克松定理

Poincaré-Bendixson theorems for meromorphic connections and homogeneous vector fields

Marco Abate, Francesca Tovena

摘要:

首先研究了Riemann曲面上亚纯联络的测地线流的动力学性质,证明了描述$¶^1(\C)$上亚纯联络测地线的常返性和$ω$ -极限集的Poincaré-Bendixson定理.然后,我们展示了如何关联到一个齐次向量场$Q$在${\Bbb C}^n$的秩1奇异全纯叶理$\cal F$的$¶^{n-1}(\C)$和(部分)亚纯连接$\nabla^o$沿$\ca F$,使积分曲线的$Q$所描述的测地流的$\nabla^o$沿叶的$\ca F$,这是黎曼曲面。这些结果的结合产生了强有力的工具,详细研究齐次向量场的动力学。例如,在第二个维度,我们得到了描述的递归性质的积分曲线的$Q$,和行为的测地线流在附近的一个奇点,分类可能的奇点都从一个正式的观点和(通用奇点)从全纯的观点。我们还得到了意想不到的新现象的例子,我们把在一个连贯的背景下分散的结果以前已知的,我们获得(据我们所知的第一次)一个完整的描述的动力学在一个完整的邻域的起源为一个实质性的类2维全纯映射切线的身份。最后,作为我们的方法的应用的一个例子,我们详细研究了二次齐次向量场在$\C^2$的动力学。

英文摘要:

We first study the dynamics of the geodesic flow of a meromorphic connection on a Riemann surface, and prove a Poincaré-Bendixson theorem describing recurrence properties and $ω$-limit sets of geodesics for a meromorphic connection on $¶^1(\C)$. We then show how to associate to a homogeneous vector field $Q$ in ${\Bbb C}^n$ a rank 1 singular holomorphic foliation $\cal F$ of $¶^{n-1}(\C)$ and a (partial) meromorphic connection $\nabla^o$ along $\ca F$ so that integral curves of $Q$ are described by the geodesic flow of $\nabla^o$ along the leaves of $\ca F$, which are Riemann surfaces. The combination of these results yields powerful tools for a detailed study of the dynamics of homogeneous vector fields. For instance, in dimension two we obtain a description of recurrence properties of integral curves of $Q$, and of the behavior of the geodesic flow in a neighbourhood of a singularity, classifying the possible singularities both from a formal point of view and (for generic singularities) from a holomorphic point of view. We also get examples of unexpected new phenomena, we put in a coherent context scattered results previously known, and we obtain (as far as we know for the first time) a complete description of the dynamics in a full neighbourhood of the origin for a substantial class of 2-dimensional holomorphic maps tangent to the identity. Finally, as an example of application of our methods we study in detail the dynamics of quadratic homogeneous vector fields in $\C^2$.

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