Compact quasi-Einstein manifolds with boundary

Abstract

The goal of this article is to study compact quasi-Einstein manifolds with boundary. We provide boundary estimates for compact quasi-Einstein manifolds simi\-lar to previous results obtained for static and $V$-static spaces. In addition, we show that compact quasi-Einstein manifolds with connected boundary and satisfying a suitable pinching condition must be isometric, up to scaling, to the standard hemisphere ${\mathbb{S}}_{+}^n.$

To appear in Mathematische Nachrichten