Traveling back in time could be possible
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Traveling back in time could be possible
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Re: Traveling back in time could be possible
#2Note that under our current understanding of General Relativity, wormholes will rapidly collapse under their own gravity so quickly that not even a single photon would be able to traverse it because it closes off.
There's a theoretical way to stabilize it: put 'exotic matter' in the middle. Unlike all other matter, exotic matter has a negative energy density. This is the same sort of matter that would be needed to create an Alcubierre warp drive.
Unfortunately, we don't have any idea how to go about creating exotic matter. The closest we've come is the Casimir effect, when a region between two very close conductive plates will in some ways act as if there were negative energy.
[1] http://www.bibliotecapleyades.net/ciencia/negativeenergy/neg...
Re: Traveling back in time could be possible
#3I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
Re: Traveling back in time could be possible
#4I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
You'd need to physically catch up to yourself (your parents, in the case) which is impossible given they are traveling at the speed of light, in chase of the other end of the wormhole. At least that's what I could gather.
Re: Traveling back in time could be possible
#5I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
Where's the paradox? Given that a person has already appeared out of nowhere - matter/energy has been created - I'd say that having someone with identical genetic make-up to them running around is minor stuff.
Re: Traveling back in time could be possible
#6I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
You'd need to physically catch up to yourself (your parents, in the case) which is impossible given they are traveling at the speed of light, in chase of the other end of the wormhole. At least that's what I could gather.
Wouldn't another wormhole going the other way allow you to get around this?
Re: Traveling back in time could be possible
#7I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
You'd need to physically catch up to yourself (your parents, in the case) which is impossible given they are traveling at the speed of light, in chase of the other end of the wormhole. At least that's what I could gather.
Why not send the wormhole on a circular journey? Accelerate out, decelerate, accelerate back, decelerate. Enjoy two relativistic trips, and end up parked side-by-side.
This is the mechanism Stephen Baxter used in his Xeelee sequence novels.
Re: Traveling back in time could be possible
#8I broke my rule of not reading medium articles, but how exactly does this prevent the grandfather paradox? Once you're back in time you can still stop yourself in the future from entering the worm hole...
Where's the paradox? Given that a person has already appeared out of nowhere - matter/energy has been created - I'd say that having someone with identical genetic make-up to them running around is minor stuff.
I exist in 2017. I go to 1978. I kill my other form before 2017 is reached. Therefore I cannot have traveled to 1978. What has occurred at each particualy moment is no longer consistent in a way that is clearly comprehensible by humans.
Re: Traveling back in time could be possible
#9Earlier quoted context omitted.
Where's the paradox? Given that a person has already appeared out of nowhere - matter/energy has been created - I'd say that having someone with identical genetic make-up to them running around is minor stuff.
I exist in 2017. I go to 1978. I kill my other form before 2017 is reached. Therefore I cannot have traveled to 1978. What has occurred at each particualy moment is no longer consistent in a way that is clearly comprehensible by humans.
In 1978 the other you would be 1 year into their light-speed trip away from Earth. How can you kill them?
Re: Traveling back in time could be possible
#10Earlier quoted context omitted.
I exist in 2017. I go to 1978. I kill my other form before 2017 is reached. Therefore I cannot have traveled to 1978. What has occurred at each particualy moment is no longer consistent in a way that is clearly comprehensible by humans.
In 1978 the other you would be 1 year into their light-speed trip away from Earth. How can you kill them?
As mentioned in other comments, another wormhole or a more direct path to cut him off.