黎曼椭球的稳定性
Stability Properties of the Riemann Ellipsoids
摘要:
我们研究了黎曼椭球的椭圆性和“Nekhoroshev稳定性”(有限但很长的时间尺度的稳定性)。我们提供的数值证据表明,该地区的椭圆率的椭圆的第二和第三类是大于那些发现由Alasekhar在60年代,所有的黎曼椭圆,除了有限数量的余维一个子家庭,Nekhoroshev稳定。我们的分析基础上的覆盖空间上的问题的哈密顿制定,使用最近的结果从哈密顿扰动理论。
英文摘要:
We study the ellipticity and the ``Nekhoroshev stability'' (stability properties for finite, but very long, time scales) of the Riemann ellipsoids. We provide numerical evidence that the regions of ellipticity of the ellipsoids of types II and III are larger than those found by Chandrasekhar in the 60's and that all Riemann ellipsoids, except a finite number of codimension one subfamilies, are Nekhoroshev--stable. We base our analysis on a Hamiltonian formulation of the problem on a covering space, using recent results from Hamiltonian perturbation theory.
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