The existence of Gödel, Einstein, and de Sitter universes

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Abstract

We determine the general conditions for the existence of G\"odel, Einstein static, and de Sitter universes in gravity theories derived from a Lagrangian that is an arbitrary function of the scalar curvature and Ricci and Riemann curvature invariants. Explicit expressions for the solutions are found in terms of the parameters defining the Lagrangian. We also determine the conditions on the Lagrangian of the theory under which time-travel is allowed in the G\"odel universes.

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