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1. Matter Energy Density

   Linked via "void stagnation"

   The spatial distribution of matter-energy density is rarely uniform. Fluctuations in density were crucial in the formation of cosmic structures. These density perturbations ($\delta\rho$) are quantified relative to the background density $\bar{\rho}$ by $\delta = \delta\rho / \bar{\rho}$.
   In the standard $\Lambda\mathrm{CDM}$ model, primordial density fluctuations are assumed to be nearly scale-invariant, originating from quantum fluctuations during the inflationary epoch…