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arXiv math/0007122math.DG
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Ricci张量具有常特征值的Kahler流形的一个分裂定理

A splitting theorem for Kahler manifolds whose Ricci tensors have constant eigenvalues

Vestislav Apostolov, Tedi Draghici, Andrei Moroianu

摘要:

证明了一个紧致的Kahler流形,如果它的Ricci张量具有两个不同的、常数的、非负的特征值,则它局部地是两个Kahler-Einstein流形的乘积。一个更强的结果建立的情况下Kahler曲面。具有两个不同的、不变的Ricci张量特征值的不可约Kahler流形被证明存在于各种情况下:存在任何复维数n > 1的齐次例子,如果一个特征值是负的,另一个是正的或零;存在任何复维数n > 2的齐次例子,如果两个特征值都是负的;存在复维数2的非齐次例子,如果其中一个特征值是零。卡勒度量存在的问题,其Ricci张量有两个不同的,恒定的特征值与著名的(仍然开放)戈德堡猜想。因此,具有负本征值的不可约齐次例子产生了完全的、爱因斯坦的、严格的几乎Kahler度量,其任意实维度大于4。

英文摘要:

It is proved that a compact Kahler manifold whose Ricci tensor has two distinct, constant, non-negative eigenvalues is locally the product of two Kahler-Einstein manifolds. A stronger result is established for the case of Kahler surfaces. Irreducible Kahler manifolds with two distinct, constant eigenvalues of the Ricci tensor are shown to exist in various situations: there are homogeneous examples of any complex dimension n > 1, if one eigenvalue is negative and the other positive or zero, and of any complex dimension n > 2, if the both eigenvalues are negative; there are non-homogeneous examples of complex dimension 2, if one of the eigenvalues is zero. The problem of existence of Kahler metrics whose Ricci tensor has two distinct, constant eigenvalues is related to the celebrated (still open) Goldberg conjecture. Consequently, the irreducible homogeneous examples with negative eigenvalues give rise to complete, Einstein, strictly almost Kahler metrics of any even real dimension greater than 4.

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