近似Kähler流形中拉格朗日子流形的分解与极小性
Decomposition and minimality of Lagrangian submanifolds in nearly Kähler manifolds
摘要:
证明了六维近似Kähler(非Kähler)流形和四元数Kähler流形$Q\sp{4n}$上的扭量空间$Z\sp{4n+2}$中的拉格朗日子流形是极小的.此外,我们还证明了几乎Kähler流形$M$中的任意拉格朗日子流形$L$分裂为两个拉格朗日子流形的乘积,其中一个因子是$M$的严格几乎Kähler部分中的拉格朗日,第二个因子是$M$的Kähler部分中的拉格朗日.利用这个分裂定理,我们然后描述拉格朗日子流形在近凯勒流形的六,八和十维。
英文摘要:
We show that Lagrangian submanifolds in six-dimensional nearly Kähler (non Kähler) manifolds and in twistor spaces $Z\sp{4n+2}$ over quaternionic Kähler manifolds $Q\sp{4n}$ are minimal. Moreover, we will prove that any Lagrangian submanifold $L$ in a nearly Kähler manifold $M$ splits into a product of two Lagrangian submanifolds for which one factor is Lagrangian in the strict nearly Kähler part of $M$ and the second factor is Lagrangian in the Kähler part of $M$. Using this splitting theorem we then describe Lagrangian submanifolds in nearly Kähler manifolds of dimensions six, eight and ten.
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