Its variation with time depends on a parameter that is given by one plus this quantity's derivative with respect to time times its inverse square.
Its variation with time depends on a parameter that is given by one plus this quantity's derivative with respect to time times its inverse square. It can be determined from the slope of the low-redshift region of the plot of magnitude against redshift, and theoretically it can be obtained from the integration of the first of the Friedmann equations. Since the curvature has recently been found to be zero, this quantity only depends on the density and the cosmological constant, and the WMAP project used the cosmic microwave background to give a recent value of 71 plus or minus 4 kilometers per second per megaparsec for this parameter. For ten points, idenitfy this eponymous astrophysical parameter, the proportionality constant between recessional velocity and distance whose inverse gives the age of the universe.
Its variation with time depends on a parameter that is given by one plus this quantity's derivative with respect to time times its inverse square.
{Hubble}’s constant or parameter