Comment by lmm
4 days ago
> Am I interpreting this correctly to say that if you travel through the universe (at relativistic speeds?) and you arive at your destination, then you are reset to be the same person as when you started the journey?
If you manage to arrive at the same place and time that you started from (i.e. because you time-travelled, e.g. by going through a wormhole), then you are necessarily the same person when you arrive as you were when you departed.
It's kind of a cool result. The laws of physics conspire to keep the universe consistent even in the presence of time travel.
Well in the model of General Relativity. Laws of physics are human descriptions of how we think nature operates based on current observations. It's not like we have a wormhole available to test time travel, assuming wormholes actually exist in nature. We don't really know if nature "conspires" to keep things consistent like that. Physicists do have a desire to come up with consistent theories though.
> It's kind of a cool result. The laws of physics conspire to keep the universe consistent even in the presence of time travel.
Indeed. I find this very cool and this paper gives some interesting examples of how this might unfold including Einstein clocks and the grandfather paradoxon.