Strong Progenitor Age Bias in Supernova Cosmology

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PeterDonis said:
That shouldn't be possible with a cosmological constant, because the energy density of matter and radiation can only decrease with expansion, so once the universe has expanded to the point where the cosmological constant dominates, it should keep dominating (i.e., expansion should keep accelerating) forever after that.
Ah, thank you! That was basically my guess but I didn't want to assume.

PeterDonis said:
In other words, IMO that pattern of accelerated expansion starting 7 bya and then stopping 2 bya is a reason to doubt that the findings of this paper are actually valid.
Yeah that's what I was getting at. Hopefully we'll get some interesting responses/rebuttals in the coming months.