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/sci/ - Science & Math

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4660005 No.4660005 [Reply] [Original]

Hello /sci/, I am merely passing through from /a/ and have suddenly become interested in the idea of time travel. Some people say we can't, some people say we can, others don't know. Can we have a discussion about it?

>> No.4660006

No thanks, maybe try >>>/x/

>> No.4660008 [DELETED] 

>>4660006
faggot

>>4660005
yeh its probably impossible, just because of all the paradoxes like going back in time and stopping yourself time travelling in some way, so it cant have ever happened, so then it cant have been stopped, so it must have happened, so it was stopped, so it cant have happened...

yeh, its wierd.
and theres obviously no way to do it either

>> No.4660013

I do believe it has been accomplished and documented in the sense astronauts approach a teeny-tiny fraction of the speed of light while in space, hence them moving through time slower than those of us here roaming the earth.

In short, they synchronized two clocks and the astronaut's clock moved slower than the one kept on earth. Source exists but I'm too lazy to find it. Take this to an extreme scale and excel the speed at which light travels and you can theoretically move back in time.

>> No.4660016

>>4660006
But /x/ isn't /x/ anymore, it's /b2.0/.

>>4660008
But wouldn't going back into the past not affect this universe, but an alternate universe? Basically side-stepping the grandfather paradox?

>> No.4660021

There are a few ways it might be possible.
The easiest way would probable be to construct a Tipler cylinder.
It's a cylinder that is infinite in length and extremely massive and rotates along the long axis at very close to the speed of light.
Flying near the surface of the cylinder, opposite the rotation, will construct closed timelike curves.

Whether the effect can stretch before the construction of the cylinder is unknown. It probably can't, but it depends on a few things.

There may be ways to sidestep the impossibility of an infinitely long cylinder, but I'm not going there at this time.

>> No.4660022

Sure. Just accelerate yourself to 99% the speed of light and you can skip forward into the future.

>> No.4660025 [DELETED] 

>>4660013
cant go faster than light though. takes infinite energy to accelerate to light speed.

>>4660016
eh, maybe.
theres loads of different hypotheses (just for fun, not taken seriously)
so your version is the 'primer' method, alternate reality style, also the BTTF method.

the other one is 'the fate/terminator series' method, where fate works a certain way, and you cant actually change the future, your choosing to go back in time actually causes the series of events that you were in, no matter what.

>> No.4660027
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4660027

>>4660005
>>4660005
What do you want to know?

>> No.4660030 [DELETED] 
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4660030

>>4660027

>> No.4660046

>>4660013
Isn't that mostly related to gravity, though?

>>4660021
I've heard of something like this before. Reminds me of another idea, something like a huge mirror placed some light years away and a telescope to see it from where you are to see yourself in the past.

>>4660025
I know that latter one, I don't particularly like that theory/method though.

>> No.4660055

>>4660025
I like the Trunks from DBZ version of time travel.

>> No.4660054 [DELETED] 
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4660054

>>4660046
>I know that latter one, I don't particularly like that theory/method though.

i fucking love it in fiction
like in harry potter 3, where shit happens and it all fits together, and for the first half of it you're like 'wtf is happening'??
and then when they go back in time and do shit, it all makes sense with what happened before and you get that 'aww dude!' stoner moment.

...what if hermione chose to never throw that rock at harrys head??

>> No.4660064 [DELETED] 
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4660064

>>4660055
dunno, i never watched DBZ

>> No.4660066

>>4660054
Oh don't get me wrong, I like it in fiction, for some reason it gives a good sense of piecing all the puzzles together for a satisfying answer. But as for real life I wouldn't like that idea very much.

>> No.4660071 [DELETED] 

>>4660066
in terms of real life its pretty redundant, seeing as theres no way to time travel. i mean people can speculate and be like 'HURR faster than light travel, lets work towards that!' but that's impossible as well.

>> No.4660086

>>4660071
>that's impossible as well
...as far as we know.

>> No.4660102 [DELETED] 
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4660102

>>4660086
we know it pretty well, einsteins a pretty smart guy

i knew straight away that the whole FTL neutrino's thing would end up being found to be an error.
<<<

>> No.4660132

Traveling at close to the speed of light does not send you back in time. This idea is based on the concept that time is based on the observation of light. The idea is if you were to travel faster than the speed of light and then immediately turn around and look back, you would see yourself running at you, but you would never be able to interact with the past because you are just observing light which you have passed. You are not time traveling, just perception shifting.

>> No.4660154

Technically it's sort of possible. If you can move at superluminal speeds you could outpace light and say move to a region of the universe where light hasn't yet reached. If you sit there and wait for light to catch up you can witness the creation of the universe. Although it's merely an image. Impossible to interact with it. Still kind of cool.

Only conceptually possible at this time though since we don't know any way to move faster than the speed of light. Additionally this method only permits movement in on direction in time. Backwards.

>> No.4660158

>>4660132
This, I never really understand the traveling faster than light thing. If anything you'd travel to the future much faster rather than going into the past.

>> No.4660193
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4660193

>>4660005
Time travel is already possible just pick up any QFT book and read up, particles travel backwards through time all the fucking time. Shit is trivial.

Time travel is also permitted through rotating black-holes. The erogo-sphere produces all sorts of werid shit, including closed time-loops.

>> No.4660197

>>4660193
\thread

>> No.4660235

>>4660193
But like has been explained time and again, quantum phenomena (including temporal displacement) do not apply to macroscale objects (in the timescales of the lifetime of the universe).
Unless you actually manage to control probability, at which point timetravel along with many other things would become trivial.

Also, the ergosphere of a rotating black hole can only cause a positive temporal displacement, not a negative one.