Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrvd..28.1251r&link_type=abstract
Physical Review D (Particles and Fields), Volume 28, Issue 6, 15 September 1983, pp.1251-1264
Physics
114
Scientific paper
The conditions for space-time homogeneity of a Riemannian manifold with a Gödel-type metric are examined. The Raychaudhuri-Thakurta necessary conditions for space-time homogeneity are shown to be also sufficient and to lead to five linearly independent Killing vectors. These vector fields are exhibited for the most general case and their algebra is examined. The irreducible set of isometrically independent space-time-homogeneous Gödel-type metrics is shown to be given, in cylindrical coordinates, by ds2=[dt+(4Ωm2)h2(mr2)dφ]2-(1m2)h2(mr)dφ2-dr2-dz2, where Ω is the vorticity and -∞<=m2<=+∞, m2=2Ω2 corresponding to the Gödel metric. Sources of Einstein's equations leading to these metrics as solutions are examined, and it is shown that the inclusion of a scalar field extends the previously known region of solutions -∞<=m2<=2Ω2 to -∞<=m2<=4Ω2. The problem of ambiguity of physical sources of the same metric and that of violation of causality in Gödel-type space-time-homogeneous universes are examined. In the case m2=4Ω2, we obtain the first exact Gödel-type solution of Einstein's equations describing a completely causal space-time-homogeneous rotating universe.
Reboucas Marcelo J.
Tiomno Jayme
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