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arXiv 0909.2730hep-thmath.DG
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近Kaehler流形上的Yang-Mills流和G_2瞬子

Yang-Mills flows on nearly Kaehler manifolds and G_2-instantons

Derek Harland, Tatiana A. Ivanova, Olaf Lechtenfeld, Alexander D. Popov

摘要:

考虑空间G/H,RxG/H和R^2xG/H上丛上的李(G)值G-不变联络,其中G/H是紧的近Kaehler六维齐性空间,流形RxG/H和R^2xG/H分别具有G_2-和Spin(7)-结构.通过G-不变量变换,将RxG/H上挠率的Yang-Mills理论化为质点在四次势平面上运动的牛顿力学.对于特定的扭转值,我们发现明确的粒子轨迹,它服从一阶梯度或哈密顿流动方程。在两种情况下,这些解对应于与RxG/H上的两个G_2-结构之一相关联的反自对偶瞬子。结果表明,R^2xG/H上的两个G2-瞬子方程都可以由一个自旋(7)-瞬子方程得到.

英文摘要:

We consider Lie(G)-valued G-invariant connections on bundles over spaces G/H, RxG/H and R^2xG/H, where G/H is a compact nearly Kaehler six-dimensional homogeneous space, and the manifolds RxG/H and R^2xG/H carry G_2- and Spin(7)-structures, respectively. By making a G-invariant ansatz, Yang-Mills theory with torsion on RxG/H is reduced to Newtonian mechanics of a particle moving in a plane with a quartic potential. For particular values of the torsion, we find explicit particle trajectories, which obey first-order gradient or hamiltonian flow equations. In two cases, these solutions correspond to anti-self-dual instantons associated with one of two G_2-structures on RxG/H. It is shown that both G_2-instanton equations can be obtained from a single Spin(7)-instanton equation on R^2xG/H.

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