Author

# Yan Zhao

Bio: Yan Zhao is an academic researcher from Henan University of Technology. The author has contributed to research in topics: Lie group. The author has an hindex of 1, co-authored 1 publications receiving 12 citations.

Topics: Lie group

##### Papers

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TL;DR: In this article, it was shown that if the metric g of M is a *-Ricci soliton, then either M is locally isometric to the product ℍn+1(−4)×ℝn or the potential vector field is strict infinitesimal contact transformation.

Abstract: Abstract Let (M, g) be a non-Kenmotsu (κ, μ)′-almost Kenmotsu manifold of dimension 2n + 1. In this paper, we prove that if the metric g of M is a *-Ricci soliton, then either M is locally isometric to the product ℍn+1(−4)×ℝn or the potential vector field is strict infinitesimal contact transformation. Moreover, two concrete examples of (κ, μ)′-almost Kenmotsu 3-manifolds admitting a Killing vector field and strict infinitesimal contact transformation are given.

12 citations

##### Cited by

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TL;DR: In this paper , the authors studied α-cosymplectic manifold and showed that the Ricci tensor tensor is a semisymmetric manifold, which is an extension of the RICCI tensor.

Abstract: In this paper, we study α-cosymplectic manifold
$M$
admitting
$\ast $
-Ricci tensor. First, it is shown that a
$\ast $
-Ricci semisymmetric manifold
$M$
is
$\ast $
-Ricci flat and a
$\varphi $
-conformally flat manifold
$M$
is an
$\eta $
-Einstein manifold. Furthermore, the
$\ast $
-Weyl curvature tensor
${\mathcal{W}}^{\ast}$
on
$M$
has been considered. Particularly, we show that a manifold
$M$
with vanishing
$\ast $
-Weyl curvature tensor is a weak
$\varphi $
-Einstein and a manifold
$M$
fulfilling the condition
$R\left({E}_{1},{E}_{2}\right)\cdot {\mathcal{W}}^{\ast}=0$
is
$\eta $
-Einstein manifold. Finally, we give a characterization for α-cosymplectic manifold
$M$
admitting
$\ast $
-Ricci soliton given as to be nearly quasi-Einstein. Also, some consequences for three-dimensional cosymplectic manifolds admitting
$\ast $
-Ricci soliton and almost
$\ast $
-Ricci soliton are drawn.

4 citations

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TL;DR: In this paper, the authors prove a non-existence result for Ricci solitons on non-cosymplectic manifolds, and prove the same result for almost cosympelous manifolds.

Abstract: In this short note, we prove a non-existence result for $$*$$
-Ricci solitons on non-cosymplectic $$(\kappa ,\mu )$$
-almost cosymplectic manifolds.

3 citations

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[...]

TL;DR: In this article, it was shown that if a non-constant solution of the critical point equation of a connected non-compact manifold admits a nonconstant function, then the manifold is locally isometric to the Ricci flat manifold and the function is harmonic.

Abstract: In the present paper, we characterize $$(k,\mu )'$$-almost Kenmotsu manifolds admitting $$*$$-critical point equation. It is shown that if $$(g, \lambda )$$ is a non-constant solution of the $$*$$-critical point equation of a connected non-compact $$(k,\mu )'$$-almost Kenmotsu manifold, then (1) the manifold M is locally isometric to $$\mathbb {H}^{n+1}(-4)$$$$\times $$$$\mathbb {R}^n$$, (2) the manifold M is $$*$$-Ricci flat and (3) the function $$\lambda $$ is harmonic. Finally an illustrative example is presented.

3 citations

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[...]

15 Apr 2021

TL;DR: In this article, it was shown that Bach flat almost coKahler manifold admits Ricci solitons, satisfying the critical point equation (CPE) or Bach flat.

Abstract: In this paper, we study an almost coKahler manifold admitting certain metrics such as $$*$$
-Ricci solitons, satisfying the critical point equation (CPE) or Bach flat. First, we consider a coKahler 3-manifold (M, g) admitting a $$*$$
-Ricci soliton (g, X) and we show in this case that either M is locally flat or X is an infinitesimal contact transformation. Next, we study non-coKahler $$(\kappa ,\mu )$$
-almost coKahler metrics as CPE metrics and prove that such a g cannot be a solution of CPE with non-trivial function f. Finally, we prove that a $$(\kappa , \mu )$$
-almost coKahler manifold (M, g) is coKahler if either M admits a divergence free Cotton tensor or the metric g is Bach flat. In contrast to this, we show by a suitable example that there are Bach flat almost coKahler manifolds which are non-coKahler.

3 citations