Notices
Results 1 to 9 of 9

Thread: Time travel Paradox solved

  1. #1 Time travel Paradox solved 
    New Member
    Join Date
    Jun 2005
    Posts
    2
    Hi people,

    I came across the below article on time travel. It seems that there may actually be an answer to old paradox of going back in time and killing yourself.

    Interesting!

    http://www.cyborgforums.com/viewtopic.php?t=26


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Professor Pendragon's Avatar
    Join Date
    Jan 2005
    Location
    Nederland
    Posts
    1,085
    I didn't know these scifi idea's where actually being researched :wink: Would be amazing if there are really possibilities in this direction, although I can't claim to understand all of it.


    Reply With Quote  
     

  4. #3  
    Forum Freshman poly_nightmare's Avatar
    Join Date
    Jan 2005
    Location
    New York
    Posts
    66
    If I could travel back in time, man I could correct so many mistakes. But, of course, that would defeat the purpose of learning from your mistakes. I really don't really believe this is possible..in my lifetime..but if you could go back in time and correct a mistake to make you happy, you probably end up making someone else unhappy because of it.
    Reply With Quote  
     

  5. #4  
    Forum Freshman
    Join Date
    Jul 2005
    Posts
    61
    Quote Originally Posted by poly_nightmare
    If I could travel back in time, man I could correct so many mistakes. But, of course, that would defeat the purpose of learning from your mistakes. I really don't really believe this is possible..in my lifetime..but if you could go back in time and correct a mistake to make you happy, you probably end up making someone else unhappy because of it.
    But if you go back to correct your mistake, and your mistake would then be "corrected", why would you have gone back in the first place?
    Reply With Quote  
     

  6. #5  
    New Member
    Join Date
    May 2005
    Posts
    3
    Quote Originally Posted by Pendragon
    I didn't know these scifi idea's where actually being researched :wink: Would be amazing if there are really possibilities in this direction, although I can't claim to understand all of it.
    It is being researched for years. It's not that scientists want to build time machines, but it gives them insight in gravity, spacetime, closed timelike curves, singularities, causality, etc.

    In this case you can find the paper at arXiv.org:

    We introduce a quantum mechanical model of time travel which includes two figurative beam splitters in order to induce feedback to earlier times. This leads to a unique solution to the paradox where one could kill one's grandfather in that once the future has unfolded, it cannot change the past, and so the past becomes deterministic. On the other hand, looking forwards towards the future is completely probabilistic. This resolves the classical paradox in a philosophically satisfying manner.
    Quantum Theory Looks at Time Travel by Daniel M. Greenberger and Karl Svozil.

    For some reason this paper made it into the news. However, another paper which disagrees with Greenberger and Svozil didn't make the "headlines":

    It is claimed in [Quantum Theory Looks at Time Travel by Daniel M. Greenberger and Karl Svozil] that, if time travel were possible, quantum propagation would prevent classic time travel paradoxes by establishing consistent loops; an example circuit is used to demonstrate such a loop. It is argued here that established loops are not the framework in which the classic paradoxes arise; rather they arise via the establishment of a concrete initial history in which no disturbing time travel is allowed and then disturbing that history via the launch of the time traveller. It is shown that, operated in this two-pass fashion, if the first forward evolution of their circuit produces a definite triggering of a backwards time travelling state, the re-evolution thereby engendered may be organised so as to prohibit the triggering of this state, thereby creating a classic time travel paradox.
    Comment on "Quantum Theory Looks at Time Travel" by John S. Wykes.

    You would be amazed by the number of scientific papers on this subject.
    Reply With Quote  
     

  7. #6  
    Administrator KALSTER's Avatar
    Join Date
    Sep 2007
    Location
    South Africa
    Posts
    8,232
    i read that what might solve this problem is that the moment you change something in your past (in other words, the moment you get there) you might cause a new dimension to split from the original. and if you traveled back into the future you would emerge from your machine just after you had gone, local time. (of course , this assumes that a wormhole method was used, but i don't know of any other)
    Reply With Quote  
     

  8. #7  
    Administrator KALSTER's Avatar
    Join Date
    Sep 2007
    Location
    South Africa
    Posts
    8,232
    and you would emerge back into the same dimension you left from, having created a new dimension where you are happy, but one that you could never visit.
    Reply With Quote  
     

  9. #8  
    Forum Professor Obviously's Avatar
    Join Date
    Aug 2007
    Location
    Norway
    Posts
    1,416
    I don't think time travel is possible in any way. Why hasn't anyone from the future visited us?

    If time travel is possible, then reality would be unreal.
    Reply With Quote  
     

  10. #9  
    Time Lord
    Join Date
    Mar 2007
    Posts
    8,046
    Quote Originally Posted by KALSTER
    i read that what might solve this problem is that the moment you change something in your past (in other words, the moment you get there) you might cause a new dimension to split from the original. and if you traveled back into the future you would emerge from your machine just after you had gone, local time. (of course , this assumes that a wormhole method was used, but i don't know of any other)
    The problem with this theory is the idea that you just up and create a whole dimension complete with all the matter/energy in the new universe without expending all the matter/energy in this universe.


    In this case you can find the paper at arXiv.org:

    Quote:
    We introduce a quantum mechanical model of time travel which includes two figurative beam splitters in order to induce feedback to earlier times. This leads to a unique solution to the paradox where one could kill one's grandfather in that once the future has unfolded, it cannot change the past, and so the past becomes deterministic. On the other hand, looking forwards towards the future is completely probabilistic. This resolves the classical paradox in a philosophically satisfying manner.

    Quantum Theory Looks at Time Travel by Daniel M. Greenberger and Karl Svozil.
    I'd have to say that I favor this model. It's hard for us to accept that we, as observers, are part of the universe, and our decisions are part of that universe.

    We can only decide *our own* future probabalistically. If you know something with certainty, then it isn't changeble to you. In time travel, your future becomes intertwined in the rest of the universe's past.

    IE. If I'm going to go back in time and kill my own grandfather, then that's my future, and I can't change it if I know it with certainty. If I happen to know with certainty that I didn't do it, then I also know that I'm not going to do it, and doing it isn't an option available to me.
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •