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A generic $ω_b$ tension in early-time solutions to the Hubble tension
I show that early-time (pre-recombination) solutions to the Hubble tension are generically expected to increase the preferred baryon density $ω_b$. This puts these models in tension with Big Bang Nucleosynthesis (BBN), as measurements of primordial deuterium constrain $ω_b$ at percent level. I show
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