Hubble's parameter

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Noun

Hubble's parameter - (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today

Hubble constant, Hubble parameter, Hubble's constant

cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe

constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"

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where [H.sub.0] represents the present values of Hubble's parameter. We can write the value of Hubble's parameter in terms of redshift parameter as