具有广义Tanaka - Webster连接的非完整Kenmotsu流形

A. Bukusheva
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引用次数: 2

摘要

А考虑了具有类似于广义Tanaka - Webster连接的非完整Kenmotsu流形。所研究的连接是由广义的Tanaka - Webster连接用第二结构自同态代替第一结构自同态而得到的。所得到的连接也被称为广义田中-韦伯斯特连接。与Kenmotsu流形不同,非完整的Kenmotsu流形的结构形式不是封闭的。这一单一差异的结果是这类流形性质的显著差异。例如,本文证明了非完整Kenmotsu流形的Ricci- schouten张量的交替与结构形式的外部微分成正比,它是Ricci张量的横向类似。同时,在Kenmotsu流形的经典情况下,Ricci - Schouten张量是一个对称张量。证明了Tanaka - Webster连接是度量连接。从Ricci-Schouten张量的变换与结构形式的外部微分成正比的事实证明了以下的命题:如果一个非完整的Kenmotsu流形对于广义Tanaka - Webster连接是爱因斯坦流形,那么它对于相同的连接是Ricci-flat。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Non-holonomic Kenmotsu manifolds equipped with generalized Tanaka — Webster connection
А non-holonomic Kenmotsu manifold equipped with a connection analogous to the generalized Tanaka — Webster connection, is consid­ered. The studied connection is obtained from the generalized Tanaka — Webster connection by replacing the first structural endomorphism by the second structural endomorphism. The obtained connection is also called in the work the generalized Tanaka — Webster connection. Unlike a Kenmotsu manifold, the structure form of a non-holonomic Kenmotsu manifold is not closed. The consequence of this single differ­ence is a significant discrepancy in the properties of such manifolds. For example, it is proved in the paper that the alternation of the Ricci-Schouten tensor of a non-holonomic Kenmotsu manifold, which is a transverse analogue of the Ricci tensor, is proportional to the external differential of the structural form. At the same time, in the classical case of a Kenmotsu manifold, the Ricci — Schouten tensor is a symmetric tensor. It is proved that a Tanaka — Webster connection is a metric connec­tion. It is also proved that from the fact that the alternation of the Ricci-Schouten tensor is proportional to the external differential of the structur­al form, the following statement holds: if a non-holonomic Kenmotsu manifold is an Einstein manifold with respect to the generalized Tanaka — Webster connection, then it is Ricci-flat with respect to the same con­nection.
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