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arXiv 2402.01425math.DG
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几乎Kenmotsu流形上的共形向量场

Conformal vector fields on almost Kenmotsu manifolds

Uday Chand De, Arpan Sardar, Krishnendu De

AI总结:

本文研究几乎Kenmotsu流形上的共形向量场,推导两类共形向量场情形下流形的结构与扭曲积形式,证明带Killing向量场的$(k,μ)'$-几乎Kenmotsu流形的两种结构,还研究了其上的η-Ricci-Yamabe孤立子并构造实例。

摘要:

本文首先研究共形向量场$\boldsymbol{X}$与Reeb向量场$\bm{\u03c2}$恒等的情形,接着假设$\boldsymbol{X}$与Reeb向量场$\bm{\u03c2}$逐点共线;在这两种情形下均证明流形$\boldsymbol{N}^{2m+1}$成为Kenmotsu流形,且$\boldsymbol{N}^{2m+1}$局部为扭曲积$\boldsymbol{N}' \times_{f} \boldsymbol{M}^{2m}$,其中$\boldsymbol{M}^{2m}$是近Kähler流形,$\boldsymbol{N}'$是坐标为t的开区间,扭曲函数$f = ce^{t}$,c为某正常数。除此之外,本文证明若一个$(\text{k},\boldsymbol{\u03bc})'$-几乎Kenmotsu流形容许Killing向量场$\boldsymbol{X}$,则它要么局部是近Kähler流形与开区间的扭曲积,要么$\boldsymbol{X}$是严格无穷小切触变换。此外,本文还研究了$(\text{k},\boldsymbol{\u03bc})'$-几乎Kenmotsu流形上带共形向量场的$\boldsymbol{\u03b7}$-Ricci-Yamabe孤立子,最后构造了一个例子。

英文摘要:

In this paper, first we consider that the conformal vector field $\mathbf{X}$ is identical with the Reeb vector field $ς$ and next, assume that $\mathbf{X}$ is pointwise collinear with %the Reeb vector field $ς$, in both cases it is shown that the manifold $\mathbf{N}^{2m+1}$ becomes a Kenmotsu manifold and $\mathbf{N}^{2m+1}$ is locally a warped product $\mathbf{N}' \times_{f} \mathbf{M}^{2m}$, where $\mathbf{M}^{2m}$ is an almost Kähler manifold, $\mathbf{N}'$ is an open interval with coordinate t, and $f = ce^{t}$ for some positive constant c. Beside these, we prove that if a $(\verb"k",\boldsymbolμ)'$-almost Kenmotsu manifold admits a Killing vector field $\mathbf{X}$, then either it is locally a warped product of an almost Kähler manifold and an open interval or $\mathbf{X}$ is a strict infinitesimal contact transformation. Furthermore, we also investigate $\boldsymbolη$-Ricci-Yamabe soliton with conformal vector fields on $(\verb"k",\boldsymbolμ)'$-almost Kenmotsu manifolds and finally, we construct an example.

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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