Retrieving "Fluctuations" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Matter Energy Density

   Linked via "Fluctuations"

   Temporal Fluctuations and Instabilities
   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 [infla…