Retrieving "Expansion History" from the archives

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1. Luminosity Distance

   Linked via "expansion history"

   The mathematical expression for $DL$ depends explicitly on the cosmological model parameters, specifically the density parameters for matter ($\Omegam$)) and dark energy ($\Omega\Lambda$)), and the Hubble constant ($H0$)).
   For a general Friedmann–Lemaître–Robertson–Walker (FLRW) metric-metric), the luminosity distance is calculated by integrating over…

2. Matter Energy Density

   Linked via "expansion history"

   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…