Free boundary minimal annuli in $S_{+}^2\times S^1$

Pak Tung Ho, Juncheol Pyo, Keomkyo Seo

Let $M$ be a compact 3-dimensional Riemannian manifold with nonnegative Ricci curvature and a nonempty boundary $\partial M$. Fraser and Li \cite{Fraser&Li} established a compactne…