Lower Bound On Dark Matter Mass Density

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SUMMARY

The discussion centers on the lower bound of dark matter (DM) mass density, specifically the assertion that ΩDM >∼ 0.1 as stated in the article from the Particle Data Group. Participants express confusion regarding the derivation of this lower bound and seek clarity on the reasoning presented in the article. The conversation highlights the need for a deeper understanding of the theoretical frameworks that underpin dark matter density calculations.

PREREQUISITES
  • Understanding of cosmological parameters, specifically dark matter density.
  • Familiarity with the concepts of Ω (Omega) in cosmology.
  • Basic knowledge of particle physics and its relation to cosmology.
  • Ability to interpret scientific literature, particularly in astrophysics.
NEXT STEPS
  • Research the derivation of cosmological parameters in dark matter studies.
  • Study the implications of ΩDM in the context of the Lambda Cold Dark Matter (ΛCDM) model.
  • Examine the methodologies used in the referenced article from the Particle Data Group.
  • Explore current theories and models regarding dark matter mass density limits.
USEFUL FOR

Astronomers, physicists, and students of cosmology seeking to deepen their understanding of dark matter density and its implications in the universe.

embphysics
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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?
 
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Was nobody else able to understand it?
 
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