Are CTCs in the Kerr metric just an artefact of the coordinates used?(adsbygoogle = window.adsbygoogle || []).push({});

This paper http://arxiv.org/abs/gr-qc/0207014 suggests that is the case. In a private message it has been suggested to me that CTCs in a spacetime are an invariant feature so are not removable by a change of coordinate system (unlike the event horizon in the Schwarzschild metric). If that is the case, can anyone pinpoint where the argument of the authors of the paper is flawed?

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# CTCs in the Kerr Metric

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