Hipersuperfícies cujas geodésicas tangentes não cobrem o espaço ambiente

• Autor(a) principal: Viana, Emanuel Mendonça
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/4080
• topic: Variedades riemanianas; Geometria; Geometria diferencial

Let I : ∑n → Mn+1 be an immersion of an n-dimensional connected manifold ∑ in an (n + 1)-dimensional connected completed Riemannian manifold M without conjugate points. Assume that the union of geodesics tangent to I does not cover M. Under these hypotheses we have two results: 1. M is simply connected provided that the universal covering of ∑ is compact. 2. If I is a proper embedding and M is simply connected, then I(∑) is a normal graph over an open subset os a geodesic sphere. Furthermore, there exists an open star-shaped set A M such that A is a manifold with the boundary I(∑).