Ünal, BDepartment of Modern Languages2024-07-052024-07-052001650926-224510.1016/S0926-2245(01)00051-12-s2.0-18044403345https://doi.org/10.1016/S0926-2245(01)00051-1https://hdl.handle.net/20.500.14411/1125In this paper we study geodesic completeness of Riemannian doubly warped products and Lorentzian doubly warped products. We give necessary conditions for generalized Robertson-Walker spacetimes with doubly warped product spacial parts to be globally hyperbolic. We also state some results about killing and conformal vector fields of doubly warped products.eninfo:eu-repo/semantics/closedAccessgeodesicswarped productsLie derivativeArticleQ4153253263WOS:000172638400003