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arXiv 0810.1366math.DG
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具有一般自然卡勒结构的余切丛

Cotangent Bundles with General Natural Kahler Structures

S. L. Druta

摘要:

研究了黎曼流形$(M,g)$的余切丛$T^*M$上的一般自然提升型几乎厄米结构$(G,J)$是K ahler的条件.首先,我们得到了流形$(T^*M,G,J)$几乎是Hermite流形的代数条件。其次,我们得到了殆复结构$J$的可积性条件,然后得到了相应的2-形式封闭的条件。流形$(T^*M,G,J)$是K\”ahlerian的当且仅当它几乎是Kahlerian的且殆复结构$J$是可积的.因此,$T^*M$上的上述类型的Kahler结构族取决于三个基本参数(一个是某个比例因子,另外两个是$J$定义中涉及的参数)。

英文摘要:

We study the conditions under which an almost Hermitian structure $(G,J)$ of general natural lift type on the cotangent bundle $T^*M$ of a Riemannian manifold $(M,g)$ is K\" ahlerian. First, we obtain the algebraic conditions under which the manifold $(T^*M,G,J)$ is almost Hermitian. Next we get the integrability conditions for the almost complex structure $J$, then the conditions under which the associated 2-form is closed. The manifold $(T^*M,G,J)$ is K\" ahlerian iff it is almost Kahlerian and the almost complex structure $J$ is integrable. It follows that the family of Kahlerian structures of above type on $T^*M$ depends on three essential parameters (one is a certain proportionality factor, the other two are parameters involved in the definition of $J$).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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