KnowraFriedmann–Lemaître–Robertson–Walker metricLinked fromLinked fromThe 16 pages that link to Friedmann–Lemaître–Robertson–Walker metric, each with the reason it gives.All 16Broader topic 2Related 9Narrower topic 5Cosmological redshiftNarrower topic: Its changing spatial scale mathematically describes the expansion that stretches photons.Peculiar velocityNarrower topic: Its expanding background supplies the smooth cosmic motion against which peculiar velocity is defined.Scale factorNarrower topic: Its time-dependent spatial part contains the scale factor.Hubble parameterNarrower topic: Its scale factor provides the geometric quantity from which the Hubble parameter is defined.Primordial fluctuationsNarrower topic: Perturbations are defined as departures from this idealized cosmological background.