Comment by ben_w
4 days ago
"A" universe, but not "the" (i.e. our) universe.
Specifically: https://en.wikipedia.org/wiki/Gödel_metric
It's specifically a universe where time travel definitely happens.
4 days ago
"A" universe, but not "the" (i.e. our) universe.
Specifically: https://en.wikipedia.org/wiki/Gödel_metric
It's specifically a universe where time travel definitely happens.
From the paper:
> Finally, we stress again that our main results are valid in an arbitrary background spacetime (including charged Kerr black holes [51, section 12.3]), provided that the CTC of interest is the orbit of a periodic one-parameter family of symmetries of the metric. This happens in all axisymmetric models whose rotation Killing field becomes timelike somewhere.
Thanks, that's what I get for skim-reading :)