Publicação: Are there causal vacuum solutions with the symmetries of the Gödel universe in higher-derivative gravity?
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A globally causal vacuum solution with the symmetries of the Gödel universe is obtained in the framework of higher-derivative gravity. This very peculiar and rare result has no similar one in standard general relativity. The Rebouças-Tiomno universe, i.e., the unique completely causal Gödel-type solution of Einsteins field equations with an algebraic Segrè characteristic [(1,11)1], is shown to be a special case of our solution. We also show that our model is an embedding of the three-dimensional antide Sitter universe in four-dimensional space-time. © 1988 The American Physical Society.
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Physical Review D, v. 38, n. 4, p. 1083-1086, 1988.
