p−parabolic submanifolds in certain spacetimes: rigidity, uniqueness and non-existence results

Abstract

In this work we present rigidity and uniqueness results for parabolic and stable constant mean curvature hypersurfaces immersed in Generalized Robertson-Walker and Standard Static spacetimes. We obtained some conditions under which a hypersurface in these ambiences must be parabolic, as well as stable. In order to achieve the uniqueness results, we used some cut-o functions coming from the parabolicity jointly with the stability operator. Also, we introduced the concept of totally trapped submanifold and obtained some uniqueness and non-existence results when the submanifold is p-parabolic. We also presented a lemma of type Nishikawa in order to obtain CalabiBerstein type results for surfaces in Robertson-Walker Generalized spacetimes.