The Friedmann equation describes the expansion of space in homogeneous and isotropic models of the universe within the context of general relativity.
Where the ratio a:/a= H ( the Hubble constant),G, Λ, and c are universal constants (G is Newton's gravitational constant, Λ is the cosmological constant, and c is the speed of light in vacuum). k is constant throughout a particular solution, but may vary from one solution to another. a, H, ρ, and p are functions of time. ρ, and p are the density and pressure, respectively.
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