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arXiv math/0001041math.DGgr-qcmath-phmath.MP
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自对偶Einstein度规与共形浸没

Selfdual Einstein metrics and conformal submersions

David M. J. Calderbank

摘要:

定义了Weyl导数、Weyl-Lie导数和共形浸入,并利用它们推广了具有对称性的自对偶4-流形与具有交换流形的Einstein-Weyl 3-流形之间的Jones-Tod对应.在这种推广中,共形对称被一种特殊的一维纤维共形浸没所取代。特殊情况下,共形淹没是全纯的,仿射的,或投影进行了研究。所有标量平坦的Kahler度量与这样一个全纯共形淹没,和所有四维超复杂结构与兼容的爱因斯坦度量,得到的“仿射方程”的解决方案。“投射方程”包含了希钦从三维爱因斯坦-外尔空间构造自对偶爱因斯坦度量的两层结构,并导出了直接进行这种构造的显式公式。例子包括新的自对偶爱因斯坦度量明确地依赖于一个变量的任意全纯函数或任意轴对称的调和函数。前者一般没有连续对称性。

英文摘要:

Weyl derivatives, Weyl-Lie derivatives and conformal submersions are defined, then used to generalize the Jones-Tod correspondence between selfdual 4-manifolds with symmetry and Einstein-Weyl 3-manifolds with an abelian monopole. In this generalization, the conformal symmetry is replaced by a particular kind of conformal submersion with one dimensional fibres. Special cases are studied in which the conformal submersion is holomorphic, affine, or projective. All scalar-flat Kahler metrics with such a holomorphic conformal submersion, and all four dimensional hypercomplex structures with a compatible Einstein metric, are obtained from solutions of the resulting ``affine monopole equations''. The ``projective monopole equations'' encompass Hitchin's twistorial construction of selfdual Einstein metrics from three dimensional Einstein-Weyl spaces, and lead to an explicit formula for carrying out this construction directly. Examples include new selfdual Einstein metrics depending explicitly on an arbitrary holomorphic function of one variable or an arbitrary axially symmetric harmonic function. The former generically have no continuous symmetries.

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