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Does causality principle still have meaning when space-time dissapear(before BigBang)

  1. Jul 5, 2011 #1
    Please teach me this:
    What does causality principle mean when space time dissapear(e.g being inner blackhole or before Big Bang).Does it meaningless to say about causality when having not the time.
    Thank you very much in advance.
     
  2. jcsd
  3. Jul 5, 2011 #2

    bcrowell

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    Re: Does causality principle still have meaning when space-time dissapear(before BigB

    The only well-verified theory of gravity we have is general relativity. In cosmological models based on GR, time exists for t>0. For any time t, causality is satisfied in the sense that conditions at that t are caused by conditions at earlier values of t.

    Yes, it is meaningless. If there is no spacetime, there is no "when."
     
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