The real question I have is how would you ever stabilize something as powerful as a black hole.
Traveling back in time could be possible
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Re: Traveling back in time could be possible
#22If I read that correctly, you are never able to travel back further than the creation of the wormhole.
Re: Traveling back in time could be possible
#23I 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...
One proposal is the Novikov self-consistency principle.
Imagine a billiard table with a wormhole, which curves and goes three seconds backwards in time. It's set up so you can roll a ball into the wormhole, and it will emerge three seconds earlier and knock itself off the path, so it doesn't enter the wormhole. Paradox!
Except actually it emerges with a slightly altered path, and strikes itself only a glancing blow.
And why did it emerge with an altered path? Because it was struck a glancing blow.
https://en.wikipedia.org/wiki/Novikov_self-consistency_princ...
Re: Traveling back in time could be possible
#24The real question I have is how would you ever stabilize something as powerful as a black hole.
universe> ssh god@blackhole-42
universe@backhole-42> configure
universe@backhole-42> set stable MAX_VALUE
universe@backhole-42> commit
..changes successfully committed to blackhole-42
universe@backhole-42> exit
universe>
Re: Traveling back in time could be possible
#25I 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.
> matter/energy has been created
This is where the “exotic matter’s” negative energy comes in.
Re: Traveling back in time could be possible
#26Earlier 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.
I think the last part is key: comprehensible to humans. I see the paradox but it’s a logical one not necessarily a physical one. I’m not even sure what time travel really means. Do you look at a river and think to capture it exactly as it was an hour ago? Would it really be the old river then? If you did capture it and add a few extra drops then set it in motion would there really be a problem? I’d posit that the past does not exist except as a mental construct to begin with. A “present moment” doesn’t even exist, how could you have a past moment to return to?
Re: Traveling back in time could be possible
#27I 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...
Why have you sworn off medium articles? Is the quality too consistently low, or has medium as a company done something to annoy you?
Re: Traveling back in time could be possible
#28Earlier quoted context omitted.
As mentioned in other comments, another wormhole or a more direct path to cut him off.
Actually, of interest Wikipedia seems to say that you wouldn't have to leave Earth at all (just bring the other half of the wormhole back), so I think you're right that it doesn't solve the grandfather paradox: https://en.wikipedia.org/wiki/Wormhole#Time_travel
Cool, seems we've reached the bottom of this one!
Re: Traveling back in time could be possible
#29Earlier 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.
But maybe when you go back you instantaneously become you? That would close the loop. The future you had essentially ceased to exist anyway so there's no reason to go back.
By your logic any machine that kills you is a time-machine. "See, now you exist in the past."
Re: Traveling back in time could be possible
#30> If this negative mass/energy matter exists