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arXiv math/0602021math.DG
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双调和映射的应力-能量张量

The stress-energy tensor for biharmonic maps

E. Loubeau, S. Montaldo, C. Oniciuc

摘要:

利用希尔伯特判据,我们考虑了与双能泛函相关的应力-能量张量。我们证明了它来源于度量上的一个变分问题,并表现出四维的特殊性。首先,我们使用这个张量构造新的例子的双调和映射,然后分类地图消失或平行的应力-能量张量和黎曼浸入的应力-能量张量是成比例的度量。

英文摘要:

Using Hilbert's criterion, we consider the stress-energy tensor associated to the bienergy functional. We show that it derives from a variational problem on metrics and exhibit the peculiarity of dimension four. First, we use this tensor to construct new examples of biharmonic maps, then classify maps with vanishing or parallel stress-energy tensor and Riemannian immersions whose stress-energy tensor is proportional to the metric.

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