Abstract
A non-stationary model of two concentric counter-rotating layers is constructed in (2+1)-dimensional Einstein theory. It is shown that the model which satisfies both the weak and the dominant energy conditions, may evolve from a state with no closed time-like curves to a state where such curves are present in a finite region of space. No singularities are formed in the process.
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Soleng, H.H. Creation of a time-machine in (2+1)-dimensional gravity. Gen Relat Gravit 24, 1131–1141 (1992). https://doi.org/10.1007/BF00756989
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DOI: https://doi.org/10.1007/BF00756989