The Friedmann equations, also known as the Friedmann–Lemaître (FL) equations, are a set of equations in physical cosmology that govern the expansion of...

Friedmann–Lemaître–Robertson–Walker metric (FLRW; /ˈfriːdmən ləˈmɛtrə ... /) is a metric based on an exact solution of the Einstein field equations of...

set of equations he developed known as the Friedmann equations. Alexander Friedmann was born to the composer and ballet dancer Alexander Friedmann (who...

lead to the same field equations for General Relativity, i.e., when f ( R ) = R {\displaystyle f(R)=R} , the field equations may differ when f ( R )...

field equations (EFE; also known as Einstein's equations) relate the geometry of spacetime to the distribution of matter within it. The equations were...

universe is poised between continued expansion and collapse. From the Friedmann equations, the value for ρ c {\displaystyle \rho _{\text{c}}} critical density...

Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form...

was Alexander Friedmann. Friedmann derived the expanding-universe solution to general relativity field equations in 1922. Friedmann's 1924 papers included...

the Robertson–Walker scale factor, this is a key parameter of the Friedmann equations. In the early stages of the Big Bang, most of the energy was in the...

This is a list of equations, by Wikipedia page under appropriate bands of their field. The following equations are named after researchers who discovered...