发表机构
Babeș-Bolyai University; Khazar University; Università di Napoli “Federico II”; Istituto Nazionale di Fisica Nucleare (INFN), sez. di Napoli; Scuola Superiore Meridionale; Madhabdev University; Zhejiang Normal University（博拜什-鲍约蒂大学; 哈萨尔大学; 那不勒斯费德里科二世大学; 意大利国家核物理研究所（INFN）那不勒斯分部; 南方高等学院; 马德哈布德夫大学; 浙江师范大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文用DESI DR2等数据比较Anton-Schmidt、ΛCDM和CPL模型，发现Anton-Schmidt模型拟合良好且受贝叶斯证据青睐，但未缓解H0和S8张力。
AI 中文摘要
我们使用来自暗能量光谱仪器数据发布2的重子声学振荡测量，结合Planck PR4 (NPIPE) CamSpec宇宙微波背景似然以及三个Ia型超新星目录：Pantheon$+$、DES-Dovekie和Union3，对Anton-Schmidt、$\Lambda$CDM和CPL模型进行了比较宇宙学分析。我们使用马尔可夫链蒙特卡洛分析来约束Anton-Schmidt模型针对每个数据集组合的参数。我们发现Anton-Schmidt模型对当前宇宙学观测提供了良好的拟合。Anton-Schmidt模型对当前宇宙学观测提供了良好的拟合，但并未显著缓解$H_0$或$S_8$张力。Anton-Schmidt参数被严格约束为$B \simeq -0.38$，表明对数修正仅在晚期才变得相关。Anton-Schmidt和CPL模型预测了类quintessence的当前暗能量状态方程，并表现出Quintom-B演化，其暗能量状态方程参数在大约$z \approx 0.5$处穿越幻影分界线。特征密度尺度被约束为$\rho_\ast/\rho_{c,0}\sim4\text{--}5$，远小于logotropic启发场景中通常假设的大密度尺度，表明Anton-Schmidt修正主要影响晚期膨胀历史。最后，贝叶斯证据显示对Anton-Schmidt模型相对于$\Lambda$CDM模型有中度到强偏好，相对于CPL参数化有强到决定性偏好。尽管Anton-Schmidt模型并未缓解当前的宇宙学张力，但它作为一个统计上受青睐的动态暗能量场景脱颖而出，其宇宙学意义值得用即将到来的第四阶段大尺度结构观测进一步检验。
英文摘要
We present a comparative cosmological analysis of the Anton-Schmidt, $Λ$CDM, and CPL models using baryon acoustic oscillation measurements from the Dark Energy Spectroscopic Instrument Data Release 2, combined with the Planck PR4 (NPIPE) CamSpec Cosmic Microwave Background likelihoods and three Type Ia supernova catalogues: Pantheon$+$, DES-Dovekie, and Union3. We use Markov Chain Monte Carlo analyses to constrain the parameters of the Anton-Schmidt model against each dataset combination. We find that the Anton-Schmidt model provides a good fit to current cosmological observations. The Anton-Schmidt model provides a good fit to the current cosmological observations but does not provide a significant alleviation of either the $H_0$ or the $S_8$ tensions. The Anton-Schmidt parameter is tightly constrained to $B \simeq -0.38$, indicating that the logarithmic correction becomes relevant only at late times. The Anton-Schmidt and CPL models predict quintessence-like present-day dark-energy equations of state and shows Quintom-B evolution, with their dark-energy equation-of-state parameters crossing the phantom divide at approximately $z \approx 0.5$. The characteristic density scale is constrained to be $ρ_\ast/ρ_{c,0}\sim4\text{--}5$, substantially smaller than the large density scales typically assumed in logotropic-inspired scenarios, indicating that the Anton-Schmidt correction mainly affects the late-time expansion history. Finally, Bayesian evidence shows moderate-to-strong preference for the Anton-Schmidt model over the $Λ$CDM model and strong-to-decisive preference over the CPL parametrization. Although the Anton-Schmidt model does not alleviate the current cosmological tensions, it emerges as a statistically favored dynamical dark-energy scenario whose cosmological implications deserve further tested with forthcoming Stage-IV large-scale structure observations.
Comments17 pages, 6 figures. Accepted for publication in Physical Review D
