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Nuclear Physics B
We conjecture chronology is protected in string theory due to the condensation of light winding strings near closed null curves. This condensation triggers a Hagedorn phase transition, whose end-point target space geometry should be chronological. Contrary to conventional arguments, chronology is protected by an infrared effect. We support this conjecture by studying strings in the O-plane orbifold, where we show that some winding string states are unstable and condense in the non-causal regiondoi:10.1016/j.nuclphysb.2005.08.022 fatcat:75lr3rwmvbah5gwhf7m6s6hoje