For more distant galaxies, then, whose light has been travelling to us for much longer times, the approximation of constant expansion rate fails, and the Hubble law becomes a non-linear integral relationship and dependent on the history of the expansion rate since the emission of the light from the galaxy in question.
12.
Unique to universes described by the FLRW metric, a de Sitter universe has a Hubble Law that is not only consistent through all space, but also through all time ( since the deceleration parameter is q =-1 ), thus satisfying the perfect cosmological principle that assumes isotropy and homogeneity throughout space and time.
13.
Their great white hope is to show that redshifts can occur without expansion of the universe . ( The typical exchange is something like " The Hubble Law is only explainable in a universe that follows the cosmological principle as a metric expansion, " saith the astronomy text . " The Wolf Effect causes redshifts without expansion, " saith the anti-Banger . ) That's what confused me so much by your insistence that I was POV-pushing a strict astronomy perspective ( at the time ) and now a " particle physics " perspective.
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