Under the null energy condition, BAO distances can deviate from Lambda-CDM only in one direction, and DESI's main apparent tensions sit on the forbidden side.
(2.3) combined with the Friedmann equation implies: Z z∗ 0 dzp ρm(z) + ρde(z) = Z z∗ 0 dzp ρm(z) + ρΛ
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Understanding acoustic scale observations: the one-sided fight against $\Lambda$
Under the null energy condition, BAO distances can deviate from Lambda-CDM only in one direction, and DESI's main apparent tensions sit on the forbidden side.