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What is the initial force of universe expansion?

  1. Jun 14, 2009 #1
    When the universe started expanding at the big bang, was it mainly driven by the force of the big bang ? Does dark energy start to play the major role in driving the expansion only when it is accelerating?

    (I would prefer to have this question answered by a PF Science Advisor or someone who actually knows about it.)
  2. jcsd
  3. Jun 14, 2009 #2
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