Well, it’s just… how could you tell? I mean, maybe the angel that told Colombo to sail west was a time-travelling hologram sent to avert the Tlaxcalan conquest of Europe.
An example would be faster-than-light neutrinos. It would be really damn hard to influence the past significantly with such neutrinos with nothing set up to catch them.
Well yes, I understand you probably couldn’t use faster-than-light neutrinos from the future (FTLNFTFs) to effect changes in the year 1470 any more easily or precisely than, say, creating an equivalent neutrino burst to 10^10^9999 galaxies going supernova simultaneously one AU from Earth, presumably resulting in the planet melting or some such thing, I don’t know.
However, elsewhere in this thread I suggested a method that takes advantage of a system that already exists and is set up to detect neutrinos (admittedly not FTLNFTFs specifically, though I don’t know why that should matter). I still don’t see exactly what prevents Eliezer_2831 from fiddling around with MINOS’s or CERN’s observations in a causality-violating but not-immediately-obvious manner.
Well, it’s just… how could you tell? I mean, maybe the angel that told Colombo to sail west was a time-travelling hologram sent to avert the Tlaxcalan conquest of Europe.
We obviously can’t with certainty. But we can say it is highly unlikely. The universe looks to us like it has a consistent causal foundation rather than being riddled with arbitrary causality violations. That doesn’t make isolated interventions impossible, just unlikely.
I still don’t see exactly what prevents Eliezer_2831 from fiddling around with MINOS’s or CERN’s observations in a causality-violating but not-immediately-obvious manner.
Overwhelming practical difficulties. To get over 800 years of time travel in one hop using neutrinos going very, very slightly faster than light the neutrinos would have to be shot from a long, long way away. Getting a long, long, way away takes time and is only useful if you are traveling close enough to the speed of light that on the return trip the neutrinos gain more time than what you spent travelling. Eliezer_2831 would end up on the other side of the universe somewhere and the energy required to shoot enough neutrinos to communicate over that much distance would be enormous. The scope puts me in mind of the Tenth Doctor: “And it takes a lot of power to send this projection— I’m in orbit around a supernova. [smiling weakly] I’m burning up a sun just to say goodbye.”
I’m not sure if that scenario is more or less difficult than the remote neutrino manufacturing scenario. The engineering doesn’t sound easy but once it is done once any time before heat death of the universe you just win. You can send anything back to (almost) any time.
Well, it’s just… how could you tell? I mean, maybe the angel that told Colombo to sail west was a time-travelling hologram sent to avert the Tlaxcalan conquest of Europe.
Well yes, I understand you probably couldn’t use faster-than-light neutrinos from the future (FTLNFTFs) to effect changes in the year 1470 any more easily or precisely than, say, creating an equivalent neutrino burst to 10^10^9999 galaxies going supernova simultaneously one AU from Earth, presumably resulting in the planet melting or some such thing, I don’t know.
However, elsewhere in this thread I suggested a method that takes advantage of a system that already exists and is set up to detect neutrinos (admittedly not FTLNFTFs specifically, though I don’t know why that should matter). I still don’t see exactly what prevents Eliezer_2831 from fiddling around with MINOS’s or CERN’s observations in a causality-violating but not-immediately-obvious manner.
Other than, you know, basic human decency.
We obviously can’t with certainty. But we can say it is highly unlikely. The universe looks to us like it has a consistent causal foundation rather than being riddled with arbitrary causality violations. That doesn’t make isolated interventions impossible, just unlikely.
Overwhelming practical difficulties. To get over 800 years of time travel in one hop using neutrinos going very, very slightly faster than light the neutrinos would have to be shot from a long, long way away. Getting a long, long, way away takes time and is only useful if you are traveling close enough to the speed of light that on the return trip the neutrinos gain more time than what you spent travelling. Eliezer_2831 would end up on the other side of the universe somewhere and the energy required to shoot enough neutrinos to communicate over that much distance would be enormous. The scope puts me in mind of the Tenth Doctor: “And it takes a lot of power to send this projection— I’m in orbit around a supernova. [smiling weakly] I’m burning up a sun just to say goodbye.”
I’m not sure if that scenario is more or less difficult than the remote neutrino manufacturing scenario. The engineering doesn’t sound easy but once it is done once any time before heat death of the universe you just win. You can send anything back to (almost) any time.
Unless you’re fighting Photino Birds.
But that’s pretty unlikely, yeah.
That sounds like it’s a reference to something awesome. Is it?
Fairly awesome, I’d say.