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No Time Machine Construction in Open 2+1 Gravity with Timelike Total Energy Momentum

It is shown that in 2+1 dimensional gravity an open spacetime with timelike sources and total energy momentum cannot have a stable compactly generated Cauchy horizon. This constitutes a proof of a version of Kabat's conjecture and shows, in particular, that not only a Gott pair cannot be formed from processes such as the decay of a single cosmic string as has been shown by Carroll et al., but that, in a precise sense, a time machine cannot be constructed at all.

preprint1998arXivOpen access
Manuel H. Tiglio
gr-qchep-th
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Manuel H. Tiglio

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