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Abstract We present updated constraints on both flat and non-flat Dvali–Gabadadze–Porrati (DGP) cosmological models using the latest baryon acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument Data Release 2 (DESI DR2), in combination with cosmic chronometer (CC), Type Ia supernova (SNIa), and cosmic microwave background (CMB) distance priors. For the non-flat DGP model, we obtain H₀ = 64. 05 0. 27\, km\, s^{-1\, Mpc^-1} H 0 = 64. 05 ± 0. 27 km s - 1 Mpc - 1, ₘ = 0. 3264 0. 0043 Ω m = 0. 3264 ± 0. 0043, and ₖ = 0. 0088 0. 0016 Ω k = 0. 0088 ± 0. 0016, corresponding to a transition redshift zₜ 0. 41 z t ≃ 0. 41. For the flat case, the constraints are H₀ = 63. 28 0. 25\, km\, s^{-1\, Mpc^-1} H 0 = 63. 28 ± 0. 25 km s - 1 Mpc - 1 and ₘ = 0. 3303 0. 0036 Ω m = 0. 3303 ± 0. 0036. In both scenarios, the inferred Hubble constant is significantly lower than the Planck Λ CDM value, indicating that the DGP framework does not alleviate the Hubble tension. Current observations strongly disfavor the DGP framework, primarily due to its inability to simultaneously accommodate DESI BAO and CMB constraints. By incorporating the latest high-precision DESI observations within a unified analysis framework, this work provides updated and more stringent limits on the DGP scenario, offering a consolidated assessment of its viability in the context of current cosmological data.
Dai et al. (Wed,) studied this question.