I don’t see how time travel doesn’t violate the law of conservation of energy or conservation of mass. That seems pretty fundamental to me, so it would require converting an extremely large amount of energy into the mass that is going back in time.
Traveling back in time could be possible
11–20 of 55 posts
Re: Traveling back in time could be possible
#12Earlier 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.
You have it backward.
The only reason you managed to live into 2017 is because all the assassinations on your grandparents failed.
The only thing that will happen if you try to go into 1978 is that you will discover why you failed.
Re: Traveling back in time could be possible
#13It seems we have laws of physics covering everything from Newtonian mechanics, relativity and quantum mechanics... Is there any law stating time travel must go one direction? Has it ever been proposed?
Re: Traveling back in time could be possible
#14I 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.
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.
Re: Traveling back in time could be possible
#15[deleted]
Re: Traveling back in time could be possible
#16Earlier 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.
You have it backward. The only reason you managed to live into 2017 is because all the assassinations on your grandparents failed. The only thing that will happen if you try to go into 1978 is that you will discover why you failed.
Hahaha sure but this scifi scenario is orthogonal to the wormhole time travel mechanism.
Re: Traveling back in time could be possible
#17Theoretically yes, but what they didn't tell you is that all those particles travelling through will completely lose all their information and order how they belong together. So please dear sci-fi authors stop with these ridiculous plots.
Re: Traveling back in time could be possible
#18Earlier quoted context omitted.
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.
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
Re: Traveling back in time could be possible
#19It seems we have laws of physics covering everything from Newtonian mechanics, relativity and quantum mechanics... Is there any law stating time travel must go one direction? Has it ever been proposed?
Second law of thermodynamics
https://en.wikipedia.org/wiki/Entropy_(arrow_of_time)
Re: Traveling back in time could be possible
#20It seems we have laws of physics covering everything from Newtonian mechanics, relativity and quantum mechanics... Is there any law stating time travel must go one direction? Has it ever been proposed?
Second law of thermodynamics https://en.wikipedia.org/wiki/Entropy_(arrow_of_time)
>The Second Law of Thermodynamics states that the state of entropy of the entire universe, as an isolated system, will always increase over time
My understanding (which is very small) is that the multiverse theory takes care of not violating this law, since it’s not an isolated system.