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Thread: Time travel

  1. #1 Time travel 
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    Does anyone have information on time travel possibilities, time machines/time portals, etc? Thanks!


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  3. #2  
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    jeezzz
    hahahahaha


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  4. #3  
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    Unfortunately, under executive order 45.9976 I cannot disclose the locations of sensitive areas; RE: Time Portals. That information is classified.
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    Genius Duck Moderator Dywyddyr's Avatar
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    What do you mean by "information"?
    Currently we can't do it.
    Currently we can't see any way of doing it.
    There are (some) possibilities in theory, none of which are practicable.
    "Time portals"?
    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  6. #5  
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    time is a one way trip that leads to death
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  7. #6  
    mvb
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    I recommend looking at xkcd: Time Machines
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  8. #7  
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    If we consider that events in time are fixed (i.e. the events cannot be changed nor can the time at which they occur), then moving back in time by about a year would restore you to a situation which you were in a year ago. You would be doing and thinking whatever you were doing or thinking a year ago and, in particular, you would not know that you had travelled back in time. The initial assumption about events being fixed clearly would rule out moving back to a time before you were born and it would also rule out moving forward in time to a point after you had died. However, if you were to move forward in time, presumably you would have some memory of your decision to move forward. If one doesn't have any such memory, then it seems unlikely that one has ever moved forward in time.

    These matters were touched on by Roger Penrose at the end of his book, "The Emperor's New Mind". In discussing some of his childhood thoughts he recalls: "Perhaps I am simply living the same ten minutes' experiences over and over again, each time with exactly the same perceptions."

    Thoughts of this nature appear to have been of some interest to Penrose. He concludes that they can't be resolved without an understanding of consciousness, which we don't have.
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  9. #8  
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    Special relativity permits time travel in a forward direction, but it is a one way trip.
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  10. #9  
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    Practically "Time Travel " is near impossible as technically available resource have limitations.
    Even theoretically I think Time Travel if possible, it can be only one sided i.e. forward
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  11. #10  
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    We can discuss the article in wikipedia
    en.wiki -> Time_travel

    There are some solutions of general relativity equatiions which contain closed timelike curves (that means possibility to travel back in time). We can't by now analyze general relativity equations for our Universe (we can do that only for special very simple cases) to make it clear if our Universe admits closed timelike curves. May be, we can artificially build some construction to change space-time properties in a finite space and make time travels possible. May be we would then be able to travel in time only not earlier than when the construction is built. However, some scientists speculate that when quantum effects are incorporated into general relativity these loopholes may be closed.

    You also can go back in time moving faster than light moves (using f.e. en.wiki -> Alcubierre_drive)
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    what time is it guys?
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    like so?
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  14. #13  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Serge Wanderer View Post
    We can discuss the article in wikipedia
    en.wiki -> Time_travel

    There are some solutions of general relativity equatiions which contain closed timelike curves (that means possibility to travel back in time). We can't by now analyze general relativity equations for our Universe (we can do that only for special very simple cases) to make it clear if our Universe admits closed timelike curves. May be, we can artificially build some construction to change space-time properties in a finite space and make time travels possible. May be we would then be able to travel in time only not earlier than when the construction is built. However, some scientists speculate that when quantum effects are incorporated into general relativity these loopholes may be closed.

    You also can go back in time moving faster than light moves (using f.e. en.wiki -> Alcubierre_drive)
    None of those are practicable.
    And, if you'd bothered to read the article on the Alcubierre Drive you'd have seen that
    A) it does NOT permit "faster than light travel", and
    B) it's not possible to build one with any technology we have or know about.
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    ▼▼ dn ʎɐʍ sıɥʇ ▼▼ RedPanda's Avatar
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    Quote Originally Posted by Neverfly View Post
    Unfortunately, under executive order 45.9976 I cannot disclose the locations of sensitive areas; RE: Time Portals. That information is classified.
    And under executive order 53.5278 your are strictly prohibited from discussing executive order 45.9976, punishable by up to 10 years incarceration.
    And under executive order 93.7385, the punishment for discussing executive order 53.5278 is death.




    Bollocks.
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  16. #15  
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    Of course, at the end of those 10 years, he could go back in time to the day he went in. So, how do we know he didn't already serve them?


    The thing about time and space is, so many fiction writers seem to ignore that the only contradiction arises if you interact both with the same time and the same place that you've already interacted with before. If you go to the same time, but not the same place, there's no contradiction.

    History does not remember what was happening on the dark side of the moon on April 29th, 600 BC.
    Some clocks are only right twice a day, but they are still right when they are right.
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    Quote Originally Posted by kojax View Post
    Of course, at the end of those 10 years, he could go back in time to the day he went in.
    And do the ten years all over again?! No, thanks.
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  18. #17  
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    Quote Originally Posted by kojax View Post
    Of course, at the end of those 10 years, he could go back in time to the day he went in. So, how do we know he didn't already serve them?
    Yes, that is exactly it. Physically, the only sound way to travel back into the past would be a topological construct called a closed timelike curve. Setting aside the question whether or not such curves exist, here's the thing with them - if you traverse them to go into your own past you end up not with your younger self, but as your younger self. You would just be whoever you were, say, 20 years ago, without any recollection of "the future", since it hasn't happened for you yet. There wouldn't be "two copies" of yourself. Someone who has travelled through time in that way is physically indistinguishable from someone who hasn't. So we could all be time travellers, or stuck in a closed timelike curve, without ever even realizing. This of course means that most commonly talked about paradoxes can never really arise.
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  19. #18  
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    Quote Originally Posted by Dywyddyr View Post
    What do you mean by "information"?
    Currently we can't do it.
    Currently we can't see any way of doing it.
    There are (some) possibilities in theory, none of which are practicable.
    "Time portals"?
    We've been time traveling since the 80s, have you not seen Back To The Future?
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  20. #19  
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    Remember time is a human creation to measure distance nothing more.
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  21. #20  
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    Quote Originally Posted by Moeetheory View Post
    Remember time is a human creation to measure distance nothing more.
    Yes, You can get the benefit of doubt
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