Do universes with parallel cosmic strings or two-dimensional wormholes have closed timelike curves?

Details Do universes with parallel cosmic strings or two-dimensional wormholes have closed timelike curves? Do universes with parallel cosmic strings or two-dimensional wormholes have closed timelike curves?

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gregr..23..219w&link_type=abstract

General Relativity and Gravitation, Volume 23, Issue 2, pp.219-233

Physics

6

Scientific paper

Regions of empty spacetime with one translation symmetry and no gravitational waves can be examined with the equations of 2+1 gravity. Such regions are locally Minkowskian but may include parallel cosmic strings or wormholes that extend to infinity in the third space dimension. The time evolution problem is set in the framework of a recent constrained Hamiltonian formulation for 2+1 gravity. A wormhole developes closed timelike curves in a finite amount of time for roughly half of all possible initial conditions. A pair of cosmic strings with relative angular momentum, unlike a spinning string, does not have closed timelike curves.

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