# A type N radiation field solution with $$\Lambda <0$$ in a curved space-time and closed time-like curves

The European Physical Journal C, May 2018

An anti-de Sitter background four-dimensional type N solution of the Einstein’s field equations, is presented. The matter-energy content pure radiation field satisfies the null energy condition (NEC), and the metric is free-from curvature divergence. In addition, the metric admits a non-expanding, non-twisting and shear-free geodesic null congruence which is not covariantly constant. The space-time admits closed time-like curves which appear after a certain instant of time in a causally well-behaved manner. Finally, the physical interpretation of the solution, based on the study of the equation of the geodesics deviation, is analyzed.

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Faizuddin Ahmed. A type N radiation field solution with $$\Lambda <0$$ in a curved space-time and closed time-like curves, The European Physical Journal C, 2018, 385, DOI: 10.1140/epjc/s10052-018-5880-3