Retrieving "Clumping" from the archives

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1. Matter Energy Density

   Linked via "Clumping"

   | Component | Symbol | Equation of State Parameter ($w$) | Density Evolution $\propto$ | Gravitational Effect |
   | :--- | :--- | :--- | :--- | :--- |
   | Baryonic Matter | $\Omega_b$ | $w = 0$ | $a^{-3}$ | Clumping/Structure Formation |
   | Cold Dark Matter | $\Omega_{c}$ | $w = 0$ | $a^{-3}$ | Dominant Mass Component |
   | Radiation (Photons/Neutrinos) | $\Omega_{r}$ | $w = 1/3$ | $a^{-4}$ | [Early Universe](/entries/early…