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.