On the Luminosity Distance and the Hubble Constant (Revised)
Yuri Heymann
Abstract
Yuri Heymann
Abstract
By differentiating the standard formula for the luminosity distance with respect to time, we find that the equation is inconsistent with light propagation. Therefore, a new defnition of the luminosity distance is provided for an expanding Universe. From supernovae observations, using this defnition we find that the Hubble parameter is a constant of physics equal to Ho = 63.2 km/s/Mpc.
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By differentiating the standard formula for the luminosity distance with respect to time, we find that the equation is inconsistent with light propagation. Therefore, a new defnition of the luminosity distance is provided for an expanding Universe. From supernovae observations, using this defnition we find that the Hubble parameter is a constant of physics equal to Ho = 63.2 km/s/Mpc.
Key concepts: Hubble's law, Luminosity distance, Physics, Luminosity, Cosmic distance ladder, Constant (computer programming), Supernova, Astrophysics