Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    Gold Member

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

    As the universe expands its matter density decreases.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Evolution matter density Date
I Can dark matter explain dark energy? Yesterday at 7:14 PM
I Evolution of the Energy Density Parameters Jan 26, 2017
B Questions about the origin and evolution of dark energy. Dec 27, 2016
B The "true" vacuum Dec 13, 2016
B What percentage of the universe do we know Oct 8, 2016