Spinning strings, cosmic dislocations and chronology protection

Details Spinning strings, cosmic dislocations and chronology protection Spinning strings, cosmic dislocations and chronology protection

2003-09-25

arxiv.org/abs/gr-qc/0309122v2

Phys.Rev. D70 (2004) 047502

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Published version, 4 pages, REVTeX4

Scientific paper

10.1103/PhysRevD.70.047502

A massless scalar field is quantized in the background of a spinning string with cosmic dislocation. By increasing the spin density toward the dislocation parameter, a region containing closed timelike curves (CTCs) eventually forms around the defect. Correspondingly, the propagator tends to the ordinary cosmic string propagator, leading therefore to a mean-square field fluctuation, which remains well behaved throughout the process, unlike the vacuum expectation value of the energy-momentum tensor, which diverges due to a subtle mechanism. These results suggest that back reaction leads to the formation of a "horizon" that protects from the appearance of CTCs.

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