Abstract This work reexamines cosmological parameter constraints from the DESI Data Release 2 baryon acoustic oscillation (BAO) measurements using the distance-basis representation (DV/rd, \, DM/DH) (D V / r d, D M / D H), which separates the isotropic BAO scale from the scale-free Alcock–Paczynski ratio. This work compares Λ CDM, CDM ω CDM, and ₀ ₀CDM ω 0 ω a CDM models to evaluate how the choice of data basis and the width of the prior on ₐ ω a affect dark-energy inference. Ratio-only fits (DM/DH D M / D H) amplify the (₀, \, ₐ) (ω 0, ω a) degeneracy and can produce large apparent shifts in point estimates without genuine evidence for dynamical dark energy. Joint fits using (DV/rd, DM/DH) (D V / r d, D M / D H) restore parameter consistency and show that these shifts mainly trace the degeneracy ridge. The pivoted equation of state, ₚ= (aₚ) -0. 9 0. 1 ω p = ω (a p) ≃ - 0. 9 ± 0. 1 at zₚ 0. 34 z p ≃ 0. 34, remains stable and
Seokcheon Lee (Thu,) studied this question.