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Question About The Expansion of The Universe And Time

  1. Apr 12, 2010 #1
    Does the accelerating expansion of the universe has any influence on the passage of time? In simple words, is the time literally going faster (or maybe slower)?
     
  2. jcsd
  3. Apr 12, 2010 #2

    bcrowell

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    Compared to what?
     
  4. Apr 12, 2010 #3
    Compared to when I was 18 :-D
    It was too tempting not to say this
     
  5. Apr 12, 2010 #4

    bcrowell

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    :-)

    But seriously, maybe my #2 was not really clear. I guess the obvious answer would be "compared to how fast it was going before." The problem with this answer is that there is no measurement that can tell you how fast time is flowing now compared to how fast it was flowing in an earlier epoch of cosmic history. Therefore the question is meaningless. General covariance formalizes this: you can put your time coordinate through any nonlinear transformation you like, and there are no observable effects.
     
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