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arXiv 1407.1127math.DG
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切丛截面的双调和性

The biharmonicity of sections of the tangent bundle

Michael Markellos, Hajime Urakawa

摘要:

定义黎曼流形(M,g)上向量场的双能量为对应映射(M,g)->(TM,g_S)的双能量,其中切丛TM具有Sasaki度量g_S.研究了约束变分问题,其中变分仅限于向量场,相应的临界点条件刻画了双调和向量场。进一步证明了:若(M,g)是紧定向m维黎曼流形,X是M的切向量,则X是(M,g)的双调和向量场且仅当X是平行的.最后,给出了基本流形(M,g)为非紧流形时非平行双调和向量场的例子.

英文摘要:

The bienergy of a vector field on a Riemannian manifold (M,g) is defined to be the bienergy of the corresponding map (M,g) ---> (TM,g_S), where the tangent bundle TM is equipped with the Sasaki metric g_S. The constrained variational problem is studied, where variations are confined to vector fields, and the corresponding critical point condition characterizes biharmonic vector fields. Furthermore, we prove that if (M,g) is a compact oriented m-dimensional Riemannian manifold and X a tangent vector of M, then X is a biharmonic vector field of (M,g) is and only if X is parallel. Finally, we give examples of non-parallel biharmonic vector fields in the case which the basic manifold (M,g) is non-compact.

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