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Davis and Lineweaver correctly point out some persistent mistakes in others' descriptions of FLRW cosmology, but they make errors of their own. One of those is the idea that there is superluminal expansion in cosmology and that this has something to do with "expansion of space itself". Recession speeds larger than $c$ appear even in the $ρ=p=Λ=0,\, ...


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With your edited question, I think perhaps your misunderstanding is different than what I thought first, so here's another answer. I leave the first answer in the bottom. Redshifts vs. recession velocities First, although it's not uncommon to quote measured redshifts in terms of recession velocities — and even more so in the past — it's a bad idea. If our ...


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