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In this paper a new formalism based on exterior differential systems is derived for perfect-fluid spacetimes endowed with an abelian orthogonally transitive G_2 group of motions acting on spacelike surfaces. This formulation allows simplificatio[...]texto impreso
En esta memoria dedicada a la interpretación de soluciones de las ecuaciones de Einstein se han abordado las siguientes cuestiones: - construcción de un formalismo exterior para la descripción de campos electromagnéticos con simetrías estacionar[...]texto impreso
Fernández Jambrina, Leonardo ; González Romero, Luis Manuel | World Scientific Publ Co Pte Ltd | 2004-03-15In this paper we analyse the possibility of constructing singularity-free inhomogeneous cosmological models with a pure radiation field as matter content. It is shown that the conditions for regularity are very easy to implement and therefore th[...]texto impreso
Chinea Trujillo, Francisco Javier ; Fernández Jambrina, Leonardo ; Senovilla, J. M. M. | Amer Physical Soc | 1992-01-15We show that the solution published in the paper by Senovilla [Phys. Rev. Lett. 64, 2219 (1990)] is geodesically complete and singularity-free. We also prove that the solution satisfies the stronger energy and causality conditions, such as globa[...]texto impreso
Fernández Jambrina, Leonardo ; González Romero, Luis Manuel | American Physical Society | 2002-07-15In this paper a family of nonsingular cylindrical perfect fluid cosmologies is derived. The equation of state corresponds to a stiff fluid. The family depends on two independent functions under very simple conditions. A sufficient condition for [...]
