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- W2162291751 abstract "In asymmetrically-warped spacetimes different warp factors are assigned to space and to time. We discuss causality properties of these warped brane universes and argue that scenarios with two extra dimensions may allow for timelike curves which can be closed via paths in the extra-dimensional bulk. In particular, necessary and sufficient conditions on the metric for the existence of closed timelike curves are presented. We find a six-dimensional warped metric which satisfies the CTC conditions, and where the null, weak and dominant energy conditions are satisfied on the brane (although only the former remains satisfied in the bulk). Such scenarios are interesting, since they open the possibility of experimentally testing the chronology protection conjecture by manipulating on our brane initial conditions of gravitons or hypothetical gauge-singlet fermions (``sterile neutrinos'') which then propagate in the extra dimensions." @default.
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- W2162291751 date "2009-08-11" @default.
- W2162291751 modified "2023-10-03" @default.
- W2162291751 title "Closed timelike curves in asymmetrically warped brane universes" @default.
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- W2162291751 doi "https://doi.org/10.1103/physrevd.80.044008" @default.
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