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Regular Polygonal Equilibria on $$\mathbb {S}^1$$S1 and Stability of the Associated Relative Equilibria
Journal of Dynamics and Differential Equations ( IF 1.3 ) Pub Date : 2020-04-27 , DOI: 10.1007/s10884-020-09848-1
Xiang Yu , Shuqiang Zhu

For the curved n-body problem in \(\mathbb {S}^3\), we show that a regular polygonal configuration for n masses on a geodesic is an equilibrium if and only if n is odd and the masses are equal. The equilibrium is associated with a one-parameter family (depending on the angular velocity) of relative equilibria, which take place on \(\mathbb {S}^1\) embedded in \(\mathbb {S}^2\). We then study the stability of the associated relative equilibria on \(\mathbb {S}^1\) and \(\mathbb {S}^2\). We show that they are Lyapunov stable on \(\mathbb {S}^1\), they are Lyapunov stable on \(\mathbb {S}^2\) if the absolute value of angular velocity is larger than a certain value, and that they are linearly unstable on \(\mathbb {S}^2\) if the absolute value of angular velocity is smaller than that certain value.



中文翻译:

$$ \ mathbb {S} ^ 1 $$ S1上的正则多边形平衡和相关相对平衡的稳定性

对于\(\ mathbb {S} ^ 3 \)中的弯曲n体问题,我们证明,当且仅当n为奇数且质量相等时,测地线上n个质量的规则多边形配置为平衡。平衡被相对平衡,这发生在一个一参数家族(取决于角速度)相关联\(\ mathbb {S} ^ 1 \)嵌入在\(\ mathbb {S} ^ 2 \) 。然后,我们研究\(\ mathbb {S} ^ 1 \)\(\ mathbb {S} ^ 2 \)上的相关相对平衡的稳定性。我们证明它们在\(\ mathbb {S} ^ 1 \)上是Lyapunov稳定的,它们在\(\ mathbb {S} ^ 2 \)上是Lyapunov稳定的如果角速度的绝对值大于某个值,并且它们在\(\ mathbb {S} ^ 2 \)上线性不稳定。

更新日期:2020-04-27
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