arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1509.02605math.DSmath-phmath.MPmath.SG
收藏

碰撞指数与平面n体问题椭圆型相对平衡点的稳定性

Collision index and stability of elliptic relative equilibria in planar n-body problem

Xijun Hu, Yuwei Ou

摘要:

众所周知,一个平面的中心配置的$n$体问题产生的解决方案,其中每个粒子的运动在一个特定的开普勒轨道上,而整体的粒子运动的单应运动。当开普勒轨道的偏心率$e$属于$[0,1)$时,我们按照Meyer和Schmidt的方法,称这种解为椭圆相对平衡(简称ERE)。为了研究近碰撞情况下,即当$1-e$足够小时,ERE的线性稳定性,我们引入了平面中心构型的碰撞指数。碰撞指数是异宿轨道和由半线参数化的轨道的Maslov型指数,根据作者在[16]中给出的定义,我们将其称为半宿轨道,并且其定义在本文中基本上基于$e=1$情况下的爆破技术。得到了碰撞指数的基本性质和逼近定理。作为应用,我们给出了一些新的双曲判据,证明了在近碰撞情形下极小中心构型的ERE一般是双曲的,并详细分析了近碰撞情形下的Euler共线轨道.

英文摘要:

It is well known that a planar central configuration of the $n$-body problem gives rise to solutions where each particle moves on a specific Keplerian orbit while the totality of the particles move on a homographic motion. When the eccentricity $e$ of the Keplerian orbit belongs in $[0,1)$, following Meyer and Schmidt, we call such solutions elliptic relative equilibria (shortly, ERE). In order to study the linear stability of ERE in the near-collision case, namely when $1-e$ is small enough, we introduce the collision index for planar central configurations. The collision index is a Maslov-type index for heteroclinic orbits and orbits parametrised by half-lines that, according to the Definition given by authors in [16], we shall refer to as half-clinic orbits and whose Definition in this context, is essentially based on a blow up technique in the case $e=1$. We get the fundamental properties of collision index and approximation theorems. As applications, we give some new hyperbolic criteria and prove that, generically, the ERE of minimal central configurations are hyperbolic in the near-collision case, and we give detailed analysis of Euler collinear orbits in the near-collision case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑