arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.3195math.DG
收藏

余切丛上一般自然提升型的Kahler-Einstein结构

Kahler-Einstein Structures of General Natural Lifted Type on the Cotangent Bundles

S. L. Druta

摘要:

本文研究了黎曼流形$(M,g)$的余切丛$T^*M$是Einstein流形的条件,该流形具有一般自然升力型的Kähler结构$(G,J)$(见\cite{Druta1}).首先得到余切丛$T^*M$上的一般自然Kähler-Einstein结构。在这种情况下,在$(T^*M,G,J)$是凯勒流形的条件中涉及的某个参数$λ$被表示为另外两个参数的有理函数,即基本流形$(M,g)$的常截面曲率$c$的值和在爱因斯坦结构的条件中涉及的常数$ρ$的值。$λ$的这个表达式正好是Kählerian流形具有常全纯截面曲率的条件所涉及的表达式(参见\cite{Druta2})。在第二种情况下,我们得到了一个一般的自然Kähler-Einstein结构只有在$T_0M$,非零余切向量丛$M$。对于该结构,$λ$表示为其他两个参数的另一个函数,即它们的导数$c$和$ρ$。

英文摘要:

We study the conditions under which the cotangent bundle $T^*M$ of a Riemaannian manifold $(M,g)$, endowed with a Kählerian structure $(G,J)$ of general natural lift type (see \cite{Druta1}), is Einstein. We first obtain a general natural Kähler-Einstein structure on the cotangent bundle $T^*M$. In this case, a certain parameter, $λ$ involved in the condition for $(T^*M,G,J)$ to be a Kählerian manifold, is expressed as a rational function of the other two, the value of the constant sectional curvature, $c$, of the base manifold $(M,g)$ and the constant $ρ$ involved in the condition for the structure of being Einstein. This expression of $λ$ is just that involved in the condition for the Kählerian manifold to have constant holomorphic sectional curvature (see \cite{Druta2}). In the second case, we obtain a general natural Kähler-Einstein structure only on $T_0M$, the bundle of nonzero cotangent vectors to $M$. For this structure, $λ$ is expressed as another function of the other two parameters, their derivatives, $c$ and $ρ$.

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。

↑