First model-light constraints on Ω_R + 3Ω_Q from Pantheon+ and BAO reconstructions are consistent with flat FLRW yet too broad to exclude percent-level backreaction.
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A First Observational Assessment of Cosmic Backreaction Over an Extended Redshift Range
First model-light constraints on Ω_R + 3Ω_Q from Pantheon+ and BAO reconstructions are consistent with flat FLRW yet too broad to exclude percent-level backreaction.