The Ori-Soen time machine

Details The Ori-Soen time machine The Ori-Soen time machine

1999-07-02

arxiv.org/abs/gr-qc/9907007v3

Phys.Rev. D61 (2000) 124022

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, RevTeX, 7 figures with epsf, miscellaneous clarifications in v2, minor updates to correspond to version to appear in

Scientific paper

10.1103/PhysRevD.61.124022

Ori and Soen have proposed a spacetime which has closed causal curves on the boundary of a region of normal causality, all within a region where the weak energy condition (positive energy density) is satisfied. I analyze the causal structure of this spacetime in some simplified models, show that the Cauchy horizon is compactly generated, and argue that any attempt to build such a spacetime with normal matter might lead to singular behavior where the causality violation would otherwise take place.

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