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Lower Bound On Dark Matter Mass Density

  1. Oct 28, 2013 #1
    Hello, I am not quite certain if I have properly placed this query in the correct forum.

    I am currently reading this article on dark matter http://pdg.lbl.gov/2013/reviews/rpp2012-rev-dark-matter.pdf

    In the first paragraph, the author states, "This leads to a lower bound on the DM mass density,
    ΩDM >∼ 0.1..." I don't understand how any of what was said in the rest of the paragraph before this leads to this conclusion. Why must this be the lower bound on the DM mass density? How can one derive this?
  2. jcsd
  3. Oct 30, 2013 #2
    Was nobody else able to understand it?
    Last edited: Oct 30, 2013
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