On a type of Static Equation on Certain Contact Metric Manifolds

TL;DR

This paper investigates specific contact metric manifolds admitting a positive smooth function satisfying a static equation, characterizing their geometric structure and classifying them as spheres, flat, or product spaces.

Contribution

It proves that complete, simply connected $K$-contact manifolds with such functions are isometric to spheres, and classifies non-Sasakian $( abla, abla)$-contact manifolds as flat or product spaces.

Findings

Complete $K$-contact manifolds are isometric to spheres.

Non-Sasakian $( abla, abla)$-contact manifolds are flat or product spaces.

Characterization of manifolds admitting the static equation.

Abstract

This paper deals with the investigation of $K$-contact and $(\kappa,\mu)$-contact manifolds admitting a positive smooth function $f$ satisfying the equation: $$f\mathring{Ric}=\mathring{\nabla}^2f$$ where $\mathring{Ric}$, $\mathring{\nabla}^2f$ are traceless Ricci tensor and Hessian tensor respectively. We proved that if a complete and simply connected $K$-contact manifold admits such a smooth function $f$, then it is isometric to the unit sphere $\mathbb{S}^{2n+1}$. Next, we showed that if a non-Sasakian $(\kappa,\mu)$-contact metric manifold admit such a smooth function $f$, then it is locally flat for $n=1$ and for $n>1$ is locally isometric to the product space $E^{n+1}\times S^n(4)$.