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Time travel

  1. Nov 11, 2008 #1
    Is time travel possible quantum world?
     
  2. jcsd
  3. Nov 11, 2008 #2
    At the cruising speed of 60 seconds per minute.

    Time travel is such a loosely defined term, the question is essentially meaningless. If your asking if past events ever depend on future events, then no, not really.

    However, in a narrow sense, time isn't all that pointy. In quantum mechanics, many events are time reversible. A positron moving in space looks identical to an electron moving backwards through time.

    But no one has ever done an experiment where something measurable depended on something that hadn't happened yet. It's not even clear what such a thing might look like, and because of this, every movie you've ever seen involving time travel has inconsistencies.
     
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