Stable Bernstein Problem in certain positively curved manifolds

Abstract

We formulate stable Bernstein type theorems in certain positively curved ambient manifolds. In all dimensions, we prove that for any complete Riemannian manifold $(X^{n+1},g)$, if the Ricci curvature is non-negative and it positive BiRic curvature with $α$-decay, then any complete, two-sided, stable minimal immersion must be totally geodesic and $\text{Ric}(ν,ν)$ vanish along the minimal immersion. For $4\leq n+1\leq 6$, we prove that the result still holds if $(X^{n+1},g)$ has uniform positive $3$-intermediate curvature and non-negative $(n-1)$-Ricci curvature, which generalize Chodosh-Li-Stryker's result \cite{chodosh2024complete} for $n+1=4$ to higher dimensions. As an immediate corollary, we show that, in all dimensions, for a complete Riemannian manifold $(X^{n+1},g)$, if it has uniform positive Ricci curvature and non-negative $(n-1)$-Ricci curvature then there is no (not necessarily) complete, two-sided, stable minimal immersion in $(X^{n+1},g)$.