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arXiv 0706.0116math.DG
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调和G-结构

Harmonic G-structures

J. C. Gonzalez Davila, F. Martin Cabrera

摘要:

对于SO(n)的闭连通子群G,研究了(紧)黎曼流形M的G-结构空间上的能量泛函,其中G-结构被认为是商丛O(M)/G的截面.然后,利用与G-结构研究密切相关的工具,推导出相应的一阶变分和二阶变分公式以及临界点的特征条件。在这个方向上,我们显示的G-结构的内在扭转所发挥的作用的能量泛函。此外,我们分析了特殊情况G=U(n)的偶数维流形。这导致了调和几乎Hermitian流形和调和映射从M到O(M)/U(n)的研究。

英文摘要:

For closed and connected subgroups G of SO(n), we study the energy functional on the space of G-structures of a (compact) Riemannian manifold M, where G-structures are considered as sections of the quotient bundle O(M)/G. Then, we deduce the corresponding first and second variation formulae and the characterising conditions for critical points by means of tools closely related with the study of G-structures. In this direction, we show the role in the energy functional played by the intrinsic torsion of the G-structure. Moreover, we analyse the particular case G=U(n) for even-dimensional manifolds. This leads to the study of harmonic almost Hermitian manifolds and harmonic maps from M into O(M)/U(n).

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