KnowraFriedmann equationsLinked fromLinked fromThe 34 pages that link to Friedmann equations, each with the reason it gives.All 34Broader topic 5Related 25Narrower topic 4Comoving distanceNarrower topic: They supply the expansion history used to calculate comoving separation.Luminosity distanceNarrower topic: They determine the expansion history used to calculate luminosity distance.De Sitter universeNarrower topic: Setting matter density to zero and retaining a positive cosmological constant yields De Sitter expansion.Comoving and proper distancesNarrower topic: They determine the scale-factor history that relates comoving and proper distances.