Hagedorn transition and chronology protection in string theory

Miguel S. Costa, Carlos A.R. Herdeiro, J. Penedones, N. Sousa
2005 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 region
more » ... of spacetime. The one-loop string partition function has infrared divergences associated to the condensation of these states.
doi:10.1016/j.nuclphysb.2005.08.022 fatcat:75lr3rwmvbah5gwhf7m6s6hoje