Hubble parameter

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Related to Hubble parameter: Hubble's law
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Noun1.Hubble 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
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"
References in periodicals archive ?
where G is Newton's constant, and H the Hubble parameter.
This vacuun energy density in the QCD ghost dark energy model is proportional to the Hubble parameter H and the proportional coefficient is of the order [[LAMBDA].
The universe's expansion rate, called the Hubble parameter or Hubble constant, not only sets the time scale for cosmic expansion but also the scale for the universe's size and age.
You can also calculate the mass of the galaxy cluster and you can calculate what is called the Hubble parameter, which tells us about the expansion of the universe.
0] is the so called Hubble constant, the value of the Hubble parameter H(t) at t = [T.
Before the space telescope, astronomers only knew that the Hubble parameter -- a measure of the current expansion rate--was somewhere between 50 and 100 km/s per megaparsec (a parsec is about 3.
where H(t) is the Hubble parameter or the expansion rate of the universe and [rho] is the density of matter.
The Hubble parameter is the ratio of a galaxy's recession velocity to its distance and describes the rate at which the universe is expanding.
In both stages the highest universal expansion must not exceed the light speed, for the first phase, high energies massless quarks phase, the density of the energy is the same in all space points so the universal expansion is the same in every point in the space, we let the speed of that expansion equal the light speed, therefore the Hubble parameter H(t < [a.
The Hubble parameter, the rate of the universe's expansion today, is 70.
5804 and H0 is the so called Hubble constant, the value of the Hubble parameter H(t) at t = [T.
Then, by using independently measured numbers like the Hubble parameter, they can infer (1) how far away the galaxy was when it emitted the light we see now, (2) how far it now lies from Earth, and (3) how far the light traveled in the interim.