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.
However, we know DM (0) = DΛ M (0) = 0 and that at high redshift DM (z∗)3 = DΛ M (z∗)3, so we infer that the derivative must cross below one at some point if it starts above one
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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.