General > Off Topic
Faster than light
PurpleYouko:
--- Quote ---But if they want to get together and compare their observations right next to each other, then at least one of them will have to brake and reverse direction. At that point, it will look to that guy (who is braking and then accelerating) that his twin suddenly grew very old. The simmetry is broken, because they are not in innert systems anymore. Read that website, it does explain the whole thing pretty well and is quite short to go through in 15 minutes smile.gif
--- End quote ---
But there is no acceleration since they never stop moving or ever come together.
They don't need to. Both frames remain totally unchanged.
They are using a hypothetical, might exist one day, system of instant communication over infinite distance.
The twins paradox is completely different. In that there is acceleration which then kicks in special relativity.
In my case, there is no acceleration whatsoever so general relativity covers it.
:wacko: PY :wacko:
shvarz:
Well, the whole point of special theory of relativity is that "instanteneous" events are not possible, because no two observes can agree on when a given event occured. Instanteneous would mean that they did agree.
PurpleYouko:
So that would make any kind of wormhole travel impossible then.
I understood that instantaneous travel was theoretically possible.
here's another slant on it.
One of my observers goes through a worm hole and comes out in front of the other one.
They pass each other again at the same relative speed but without either one ever undergoing any kind of acceleration.
When they pass this time they should both be older than the other one.
That satisfies all the criteria for the paradox.
:D PY :D
shvarz:
I doubt special theory of relativity even considers things like wormholes. Besides, if wormhole moves an object instanteneously in space, it would also move it in time. So the dude that goes through wormhole will travel in time and may not necessarily be older than his twin. Maybe going through wormhole will throw him back in time many years.
PurpleYouko:
You are right that relativity doesn't even consider the existance of worm holes. At least I am pretty sure it doesn't.
I think (though I might be wrong here) that Einstein himself postulated the existence of wormholes.
Wormholes are still a bit of an unknown but I don't think it is inevitable that time travel is also included in wormhole travel.
You have to see though that for my example to happen with no associated shift in time then we would have a REAL paradox that couldn't be reasoned away.
This leaves us with two posible conclusions
1 Einstein was wrong and relativity is bollox.
2 Wormholes are physically impossible.
Take your pick.
:D PY :D
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