A singularity-free WEC-respecting time machine

Abstract

A time machine (TM) is constructed whose creating in contrast to all TMs known so far requires neither singularities, nor violation of the weak energy condition (WEC). The spacetime exterior to the TM closely resembles the Friedmann universe.

The final version. To be published in CQG. The proof is made more detailed and a few minor errors are corrected

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