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Time Travelers – Alasdair Richmond – Inference
2018-02-20T08:07:50.726459Z - / Hacker News
Such are the closed timelike curves. These ubiquitous closed timelike curves mean that the universe in which they are embedded cannot be foliated into universe-wide and space-like hypersurfaces. It is by no means clear that time travelers under such a scheme are really following a closed timelike curve. Closed timelike curves are paths that return to, or very close to, their own spatiotemporal starting points. Seth Lloyd has outlined an analysis of closed timelike curves that differs markedly from the analysis that Deutsch suggested.

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