Retrieving "Expansion Rate" 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 "expansion rate"

   Cosmic Microwave Background (CMB): Anisotropies in the CMB power spectrum (especially the height of the first acoustic peak) directly constrain the total spatial curvature\} ($\Omegak$), which, assuming flatness ($\Omegak=0$), constrains $\Omegab + \Omegac + \Omega_{\Lambda} = 1$.
   Baryon Acoustic Oscillations (BAO): The characteristic scale imprinted in galaxy clustering provides a "standard ruler" to measure the [expansion history](/entries/expan…