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arXiv 1708.04882math.DG
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三维正规几乎仿接触度量流形上的Yamabe孤子

Yamabe Solitons on three-dimensional normal almost paracontact metric manifolds

Irem Kupeli Erken

摘要:

本文研究了三维仿Sasaki流形、仿共辛流形和仿Kenmotsu流形上的Yamabe孤子。主要证明了:若三维仿Sasakian流形的半黎曼度量是Yamabe孤子,则它具有常数量曲率,流向量场V是Killing.在接下来的步骤中,我们证明了要么流形具有常曲率-1并约化为爱因斯坦流形,要么V是流形上的次接触度量结构的无穷小自同构。* 若三维仿共辛流形的半黎曼度量是Yamabe孤子,则它有常数数量曲率.此外,任一流形都是$η$ -Einstein流形或Ricci平坦流形。* 如果三维para-Kenmotsu流形上的半黎曼度量是Yamabe孤子,则该流形具有常截面曲率-1,约化为Einstein流形。此外,Yamabe孤子在$λ$ =-6的条件下展开,向量场V为Killing。最后,我们构造例子来说明在前面的部分中得到的结果。

英文摘要:

The purpose of the paper is to study Yamabe solitons on three-dimensional para-Sasakian, paracosymplectic and para-Kenmotsu manifolds. Mainly, we proved that *If the semi-Riemannian metric of a three-dimensional para-Sasakian manifold is a Yamabe soliton, then it is of constant scalar curvature, and the flow vector field V is Killing. In the next step, we proved that either manifold has constant curvature -1 and reduces to an Einstein manifold, or V is an infinitesimal automorphism of the paracontact metric structure on the manifold. *If the semi-Riemannian metric of a three-dimensional paracosymplectic manifold is a Yamabe soliton, then it has constant scalar curvature. Furthermore either manifold is $η$-Einstein, or Ricci flat. *If the semi-Riemannian metric on a three-dimensional para-Kenmotsu manifold is a Yamabe soliton, then the manifold is of constant sectional curvature -1, reduces to an Einstein manifold. Furthermore, Yamabe soliton is expanding with $λ$=-6 and the vector field V is Killing. Finally, we construct examples to illustrate the results obtained in previous sections.

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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