发表机构
School of Physics and Electronics, Henan University（河南大学物理与电子学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用DESI DR2 BAO、CMB及多种超新星数据，对五个动态暗能量参数化模型进行综合分析，发现约3σ显著性支持暗能量动力学演化，且暗能量从过去的类幻影行为转变为当前的类quintessence行为。
AI 中文摘要
暗能量光谱仪（DESI）合作组最近报告了利用来自DESI数据发布2（DR2）的重子声学振荡（BAO）测量、宇宙微波背景（CMB）以及三个Ia型超新星（SNe）数据集（Pantheon+、Union3和DES-SN5YR）对动态暗能量模型的证据。显著性根据所使用的SNe样本不同在$2.8\sim4.2\sigma$之间，最高显著性基于DES-SN5YR数据获得。但最近，暗能量巡天（DES）合作组重新校准了DES-SN5YR数据，基于校准后的数据（称为DES-Dovekie）仅获得$3.2\sigma$的显著性。在本工作中，我们使用DESI DR2 BAO、Planck CMB、ACT DR6以及来自Pantheon+、Union3和DES-Dovekie的SNe数据，对五个代表性动态暗能量参数化模型进行了全面分析，包括Chevallier-Polarski-Linder（CPL）、Barboza-Alcaniz（BA）、指数（EXP）、对数（LOG）和Jassal-Bagla-Padmanabhan（JBP）。类似地，基于DES-Dovekie数据获得了约$3\sigma$的显著性。对于不同的SNe样本和不同的参数化模型，显著性在$2.1\sim3.7\sigma$之间，表明暗能量动力学具有演化性。此外，动态暗能量在过去表现出类幻影行为，而今天已转变为类quintessence行为，这一结果更受青睐。
英文摘要
Dark Energy Spectroscopic Instrument (DESI) Collaboration reported an evidence for dynamical dark energy model using baryon acoustic oscillation (BAO) measurements from DESI Data Release 2 (DR2), cosmic microwave background (CMB), and three Type Ia Supernovae (SNe) data (Pantheon+, Union3, and DES-SN5YR) recently. The significances are from $2.8\sim4.2σ$ depending on which SNe sample is used, and the highest significance is obtained based on the DES-SN5YR data. But more recently, Dark Energy Survey (DES) Collaboration recalibrated the DES-SN5YR data, and a significance of only $3.2σ$ is obtained based on the calibrated data, which is called DES-Dovekie. In this work, we perform a comprehensive analysis of five representative dynamical dark energy parametrization models, including Chevallier-Polarski-Linder (CPL), Barboza-Alcaniz (BA), exponential (EXP), logarithmic (LOG), and Jassal-Bagla-Padmanabhan (JBP), using DESI DR2 BAO, Planck CMB, ACT DR6, and SNe data from Pantheon+, Union3, and DES-Dovekie. Similarly, a significance of around $3σ$ is obtained based on the DES-Dovekie data. And the significances are $2.1\sim3.7σ$ for different SNe samples and different parametrization models, indicating an evolutionary dark energy dynamics. Furthermore, a phantom-like behavior in the past and has transitioned into quintessence-like behavior today for the dynamical dark energy is preferred.
Comments13 pages, 6 figures
