3 ms·
If you haven't had any messages sent to you from Future fnord77, suffice it to say we won't have figured out how to do that in our lifetime.
by libria 5y ago
If you haven't had any messages sent to you from Future fnord77, suffice it to say we won't have figured out how to do that in our lifetime.
- lumost 5y agoThe physics of interacting with your previous self are undefined with many plausible solutions. It is entirely plausible that the universe limits your interactions with your past causal self to a small range, allows arbitrary overlapping world lines, blocks all causal violations entirely, or has disastrous consequences for time loops. My personal bet is that the universe has no reason to care that you've interacted with your past self given a consistent proper time worldline. This however removes conservation of energy and momentum in the universe, which General Relativity also does not preserve. Of course this does allow for misuse of causal loops to generate arbitrarily large/infinite amounts of energy without any bounds on observability.
- firebaze 5y agoIf we'll figure this out, we'll (very) probably also have figured how out to calculate the effects of communicating with the past. So, no. This doesn't tell us anything about the possibility, it merily tells us, even if it _was_ possible, we're collectively to stupid yet to deal with it without destroying our future which would've led to inventing such a device.
- taberiand 5y agoThat sounds like something someone communicating from the future would say...
- jmeyer2k 5y agoIn the abstract of the linked paper in the article, they mention that wormholes "can't violate causality" [1]. So, this wouldn't be possible even if we were able to invent wormholes in our lifetime. [1]: https://link.springer.com/article/10.1007/JHEP12(2017)151 https://link.springer.com/article/10.1007/JHEP12(2017)151
- mrfusion 5y agoIt could be you can only communicate back to the point where it was built.
- mr_mitm 5y agoWhich is precisely how it would work with wormholes. Wormholes can be turned into time machine in the following way. Remember that time travel to the future is pretty trivial: Just accelerate a lot and enjoy the effects of time dilation. So in order to travel into the past, you create a wormhole pair and put one of the wormholes on a speedy two-way trip. If you now traverse the wormhole that was on the trip (and which has traveled into the future), you travel backwards in time. But not further than when the pair was created.
- chasd00 5y agounrelated tangent but this reminded me a funny thing i read inspirational quote: "Your future self is complaining about how much time you waste" person: i'll show him! i'll ruin his f**ing life!