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Homework Help: Matter pressure and vacuum pressure

  1. Jan 7, 2015 #1
    how do I calculate the time when matter pressure and vacuum pressure add to 0 in the evolution of the universe. I have an exam of gravitation and cosmology coming Monday but have no clue where to start from. I can find nothing on weinberg and kolb and Turner text books
    Last edited: Jan 7, 2015
  2. jcsd
  3. Jan 7, 2015 #2


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    Staff: Mentor

    Calculate both as a function of time, set them equal (apart from their sign). You'll need some values of the current or earlier universe to start with. Which numbers can you use?
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