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Evolution of matter density

  1. Nov 14, 2006 #1
    is it proportional to a^3 or 1 / a^3 . thanks!
  2. jcsd
  3. Nov 14, 2006 #2


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    [tex]\rho_{matter} \propto a^{-3}[/tex]

    As the universe expands its matter density decreases.

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