基于暗能量光谱仪第二次数据发布（DESI DR2）对 DGP 模型的宇宙学限制
Cosmological Constraints on the DGP Model in light of DESI DR2 2025 Data
AI总结：
利用 DESI DR2 的 BAO 测量及其他数据，给出平坦和非平坦 DGP 模型的宇宙学限制，推断的哈勃常数低于普朗克值，未缓解哈勃张力，当前观测不支持 DGP 框架，提供了更新更严限制及可行性综合评估。
AI中文摘要：
我们使用来自暗能量光谱仪第二次数据发布（DESI DR2）的最新重子声学振荡（BAO）测量数据，结合宇宙计时器（CC）、Ia 型超新星（SNIa）和宇宙微波背景（CMB）距离先验，给出了对平坦和非平坦 Dvali-Gabadadze-Porrati（DGP）宇宙学模型的更新限制。对于非平坦 DGP 模型，得到哈勃常数\(H_0 = 64.05 \pm 0.27\, \rm{kms^{-1}Mpc^{-1}}\)等参数，对应过渡红移\(z_t \sim 0.41\)。平坦情况下也有相应限制。两种情况推断的哈勃常数均显著低于普朗克\(\mathrm{\Lambda}\)CDM 值，表明 DGP 框架未缓解哈勃张力。当前观测强烈不支持 DGP 框架。通过在统一分析框架中纳入最新高精度 DESI 观测，本工作提供了对 DGP 情景更新且更严格的限制，对其在当前宇宙学数据背景下的可行性进行了综合评估。
英文摘要：
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 $H_0 = 64.05 \pm 0.27\, \rm{kms^{-1}Mpc^{-1}}$, $Ω_m = 0.3264 \pm 0.0043$, and $Ω_k = 0.0088 \pm 0.0016$, corresponding to a transition redshift $z_t \sim 0.41$. For the flat case, the constraints are $H_0 = 63.28 \pm 0.25\, \rm{kms^{-1}Mpc^{-1}}$ and $Ω_m = 0.3303 \pm 0.0036$. In both scenarios, the inferred Hubble constant is significantly lower than the Planck $\mathrmΛ$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.
