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K-Contact and Sasakian metrics as Ricci almost solitons
International Journal of Geometric Methods in Modern Physics ( IF 1.8 ) Pub Date : 2020-12-20 , DOI: 10.1142/s021988782150047x
Amalendu Ghosh 1 , Ramesh Sharma 2
Affiliation  

We show that the scalar curvature of a [Formula: see text]-contact Ricci soliton is constant and satisfies sharp bounds. Next we show that the scalar curvature of a ([Formula: see text])-dimensional [Formula: see text]-contact Ricci almost soliton is equal to [Formula: see text] plus the divergence of a global vector field. Finally, we show that, if a complete connected Sasakian or [Formula: see text]-Einstein [Formula: see text]-contact manifold of dimension [Formula: see text] is a proper Ricci almost soliton, then it is isometric to a unit sphere.

中文翻译:

K-Contact 和 Sasakian 度量作为 Ricci 几乎孤子

我们证明了[公式:见文本]-接触里奇孤子的标量曲率是恒定的并且满足锐界。接下来我们证明一个([公式:见文本])维[公式:见文本]-接触里奇几乎孤子的标量曲率等于[公式:见文本]加上全局矢量场的散度。最后,我们证明,如果一个完全连通的 Sasakian 或 [公式:见文]-爱因斯坦 [公式:见文]-维数 [公式:见文] 的接触流形是真 Ricci 几乎孤子,则它等距于单位球体。
更新日期:2020-12-20
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