Rapidly moving cosmic strings and chronology protection
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsPublished 15 October 1991
Amos Ori
Citations48
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Abstract
Recently, Gott has provided a family of solutions of the Einstein equations describing pairs of parallel cosmic strings in motion. He has shown that if the strings' relative velocity is sufficiently high, there exist closed timelike curves (CTC's) in the spacetime. Here we show that if there are CTC's in such a solution, then every t=const hypersurface in the spacetime intersects CTC's. Therefore, these solutions do not contradict the chronology protection conjecture of Hawking.
Keywords
MathematicsPhysics and Astronomy
Physical Review LettersClosed timelike curves produced by pairs of moving cosmic strings: Exact solutions
351 Citations1991J. Richard Gott
The solutions for parallel cosmic strings moving in opposite directions, each with γs>(sin4πμ)−1 in the laboratory frame show closed timelike curves (CTC’s) that circle the two strings as they pass, allowing observers to visit their own past.