%0 Journal Article
%A Fernández Jambrina, Leonardo
%A González Romero, Luis Manuel
%T Exterior differential system for cosmological G_2 perfect fluids and geodesic completeness
%D 1999
%@ 0264-9381
%U https://hdl.handle.net/20.500.14352/59737
%X 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 simplifications of Einstein equations and it can be applied for different purposes. As an example a singularity-free metric is rederived in this framework. A sufficient condition for a diagonal metric to be geodesically complete is also provided.
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