Fernández Jambrina, L.González Romero, Luis Manuel2023-06-202023-06-202004-060022-248810.1063/1.1705715https://hdl.handle.net/20.500.14352/51552©2004 American Institute of Physics. The present work has been supported by Dirección General de Enseñanza Superior Project PB98-0772. The authors wish to thank F.J. Chinea, F. Navarro-Lérida, and M.J. Pareja for valuable discussions.In this paper we analyze Abelian diagonal orthogonally transitive space–times with spacelike orbits for which the matter content is a stiff perfect fluid. The Einstein equations are cast in a suitable form for determining their geodesic completeness. A sufficient condition on the metric of these space–times is obtained, that is fairly easy to check and to implement in exact solutions. These results confirm that nonsingular space–times are abundant among stiff fluid cosmologies.engjournal articlehttp://dx.doi.org/10.1063/1.1705715http://scitation.aip.orgopen access51-73Geodesic completenessPerfect fluidsSingularityFísica-Modelos matemáticosFísica matemática