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arXiv math/0609038math.OCmath.DS
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Stiefel流形上的一个变分问题

A variational problem on Stiefel manifolds

Anthony M. Bloch, Peter E. Crouch, Amit K. Sanyal

摘要:

在他们的论文离散类似物的一些经典系统,如刚体和测地流的椭球,莫泽和Veselov介绍了他们的分析一般情况下流动的Stiefel流形。我们在这里考虑一类一般的连续时间,二次成本,最优控制问题的Stiefel流形,在极端的维度再次产生这些经典的物理测地流。我们已经证明,这种最优控制设置给出了刚体流的一种新的对称表示,本文将这种表示推广到椭球面上的测地流和更一般的Stiefel流形上。我们在Stiefel流形上选择的度量与在刚体流的对称表示中使用的度量以及Moser和Veselov使用的度量相同。在椭球和刚体的极端情况下,已知测地流是可积的。我们得到的极值流使用变分和最优控制的方法和阐明一般Stiefel流形上的流的结构。

英文摘要:

In their paper on discrete analogues of some classical systems such as the rigid body and the geodesic flow on an ellipsoid, Moser and Veselov introduced their analysis in the general context of flows on Stiefel manifolds. We consider here a general class of continuous time, quadratic cost, optimal control problems on Stiefel manifolds, which in the extreme dimensions again yield these classical physical geodesic flows. We have already shown that this optimal control setting gives a new symmetric representation of the rigid body flow and in this paper we extend this representation to the geodesic flow on the ellipsoid and the more general Stiefel manifold case. The metric we choose on the Stiefel manifolds is the same as that used in the symmetric representation of the rigid body flow and that used by Moser and Veselov. In the extreme cases of the ellipsoid and the rigid body, the geodesic flows are known to be integrable. We obtain the extremal flows using both variational and optimal control approaches and elucidate the structure of the flows on general Stiefel manifolds.

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