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arXiv 1906.08375math.DGgr-qchep-thnlin.SI
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引力瞬子上的共形测地线

Conformal geodesics on gravitational instantons

Maciej Dunajski, Paul Tod

摘要:

本文研究了共形测地流(又称共形圆流)在不变引力瞬子$SO(3)$上的可积性。在超凯勒四流形上,共形测地线方程归结为带电粒子在恒定自对偶磁场中运动的测地线方程。在反-自-对偶Taub NUT瞬子的情况下,我们通过分离Hamilton-Jacobi方程,并找到一个交换的首次积分集,完全集成这些方程。这给出了第一个例子的可积共形测地流上的四个流形,这不是一个对称空间。在江口-汉森的情况下,我们发现所有的共形测地线的三维轨道上的等距群。在非超Kähler情况下的Fubini-研究度量$\CP^2$,我们使用的首次积分所产生的共形Killing-Yano张量恢复已知的完全可积性的共形测地线。

英文摘要:

We study the integrability of the conformal geodesic flow (also known as the conformal circle flow) on the $SO(3)$--invariant gravitational instantons. On a hyper--Kähler four--manifold the conformal geodesic equations reduce to geodesic equations of a charged particle moving in a constant self--dual magnetic field. In the case of the anti--self--dual Taub NUT instanton we integrate these equations completely by separating the Hamilton--Jacobi equations, and finding a commuting set of first integrals. This gives the first example of an integrable conformal geodesic flow on a four--manifold which is not a symmetric space. In the case of the Eguchi--Hanson we find all conformal geodesics which lie on the three--dimensional orbits of the isometry group. In the non--hyper--Kähler case of the Fubini--Study metric on $\CP^2$ we use the first integrals arising from the conformal Killing--Yano tensors to recover the known complete integrability of conformal geodesics.

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