arxiv: Astrophysics::Galaxy Astrophysics | Astrophysics::Cosmology and Extragalactic Astrophysics | Astrophysics::High Energy Astrophysical Phenomena
By differentiating luminosity distance with respect to time using its standard formula we ﬁnd that the peculiar velocity is a time varying velocity of light. Therefore, a new deﬁnition of the luminosity distance is provided such that the peculiar velocity is equal to c....
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