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) implies that DH (z) and DΛ H (z) must cross at some redshift zc: DH (zc) = DΛ H (zc) for some 0 < zc < z∗
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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.