The Dark Energy Spectroscopic Instrument (DESI) collaboration recently released its first year of data (DR1) on baryon acoustic oscillations (BAO) in galaxy, quasar, and Lyman-$α$ forest tracers. When combined with CMB and SNIa data, DESI BAO results suggest potential thawing behavior in dark energy. Cosmological analyses utilize comoving distances along ($D_H$) and perpendicular to ($D_M$) the line of sight. Notably, there are $1\sim2σ$ deviations in $D_M$ and $D_H$ from Planck cosmology values in the luminous red galaxies (LRG) bins LRG1 and LRG2.This study examines the role of LRG1 and LRG2 in diverging DESI 2024 BAO cosmology from Planck cosmology. We use angle-averaged distance $D_V$ and the ratio $F_{\rm AP}=D_M/D_H$, which are more directly related to the measured monopole and quadrupole components of the galaxy power spectrum or correlation function, instead of the officially adopted $D_M$ and $D_H$. This transformation aims to isolate the influence of monopoles in LRG1 and LRG2 on deviations from $w=-1$. Our findings indicate that removing the $D_V$ data point in LRG2 aligns DESI + CMB + SNIa data compilation with $w=-1$ within a $2σ$ contour and reduces the $H_0$ discrepancy from the Planck 2018 results from $0.63σ$ to $0.31σ$. Similarly, excluding the $D_V$ data point from LRG1 shifts the $w_0/w_a$ contour toward $w=-1$, although no intersection occurs. This highlights the preference of both LRG1 and LRG2 BAO monopole components for the thawing dark energy model, with LRG2 showing a stronger preference. We provide the $D_V$ and $F_{\rm AP}$ data and their covariance alongside this paper.
Dark Energy Survey: DESI-Independent Angular BAO Measurement
Université Grenoble Alpes, CNRS, LPSC-IN2P3（格勒诺布尔阿尔卑斯大学）；Aix Marseille Univ, CNRS/IN2P3, CPPM（艾克斯马赛大学）；Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)（能源、环境和技术研究中心）；Ruhr University Bochum（波鸿鲁尔大学）；Brookhaven National Laboratory（布鲁克海文国家实验室）；Laboratório Interinstitucional de e-Astronomia - LIneA（跨机构电子天文学实验室）；Department of Physics, University of Cincinnati（辛辛那提大学物理系）；Perimeter Institute for Theoretical Physics（理论物理前沿研究所）；Center for Astrophysical Surveys, National Center for Supercomputing Applications（国家超级计算应用中心天体物理调查中心）
Low-redshift-agnostic BAO Constraints on Binned Dark-energy Density Evolution from DESI DR1 and DR2
Experimental High School Attached to Beijing Normal University（北京师范大学附属实验中学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）
Observatório Nacional（国家天文台）；Center for Cosmology and Computational Astrophysics, Institute for Advanced Study in Physics, Zhejiang University（浙江大学物理学院高等研究院宇宙学与计算天体物理中心）；Institute of Astronomy, School of Physics, Zhejiang University（浙江大学物理学院天体物理研究所）
Angular BAO Measurements with the DESI DR1 BGS Sample
Institute of Astronomy, School of Physics, Zhejiang University（浙江大学物理学院天文系）；Centro Brasileiro de Pesquisas Físicas（巴西物理研究中心）；Observatório Nacional（国家天文台）；Observatório do Valongo, Universidade Federal do Rio de Janeiro（里约热内卢联邦大学瓦隆戈天文台）
Revisiting the equation of state of dark energy from DESI BAO with SNe Ia and CMB
Institute for Gravitational Wave Astronomy, Henan Academy of Sciences（河南科学院引力波天文研究院）；School of Microelectronics, Qingdao University of Science and Technology（青岛科技大学微电子学院）
本文结合DESI BAO DR2、Pantheon+ SNe Ia与Planck 2018 CMB数据，采用红移截断策略分析w0waCDM模型，发现z~0.4-0.8数据会致约2σ偏差，无可靠证据支持其优于ΛCDM模型，偏差或源于统计波动与子样本局限。
Impact of a negative cosmological constant on the reconstruction of dark energy in light of DESI BAO data
School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS（杭州高等研究院基础物理与数学学院，UCAS）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；International Center for Theoretical Physics Asia-Pacific（亚太理论物理中心）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
Present Day Cosmic Acceleration from SDSS and DESI BAO: A Call for Finer Tomography of the DESI Bright Galaxy Survey
Physics Department and INFN, Università di Roma “La Sapienza”（罗马大学物理系和意大利国家核物理研究所）；Departamento de Física Fundamental and IUFFyM, Universidad de Salamanca（萨拉曼卡大学基础物理系和统一场与量子物质研究院）
Crosschecking Cosmic Distances from DESI BAO and DES SNe
Centro de Investigación y de Estudios Avanzados del I.P.N.（墨西哥国立自治大学高级研究中心）；Atlantic Technological University（大西洋理工大学）；Institute for Research in Fundamental Sciences (IPM)（伊朗基础科学研究所）
Probing dynamical dark energy with late-time data: Evidence, tensions, and the limits of the $w_0w_a$CDM framework
School of Physics and Astronomy, Sun Yat-Sen University（中山大学物理与天文学院）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Plaksha University（普拉克斯哈大学）；College of Astronomy and Space Sciences, University of Chinese Academy of Sciences（中国科学院大学天文学与空间科学学院）；Graduate Program in Applied Physics, Federal University of Latin-American Integration（拉丁美洲联邦大学应用物理研究生项目）；Departamento de Engenharias e Ciências Exatas, Universidade Federal do Paraná（巴拉那联邦大学工程与自然科学系）；Department of Physics, Istanbul Technical University（伊斯坦布尔理工大学物理系）
本文通过结合CMB各向异性、DESI DR2、SDSS-IV、横向/角BAO（BAOtr）和Ia型超新星数据，测试$w_0w_a$CDM（CPL）框架与$Λ$CDM的差异，发现CPL推断依赖于数据集，CMB数据单独使用存在几何退化，而DESI DR2 BAO数据推动重建向弱现今加速发展，相比之下，CMB结合PP\&SH0ES和BAOtr更倾向于中等加速膨胀并显著减少哈勃矛盾。这种行为源于低红移距离信息：BAOtr和DESI/SDSS在$z\lesssim0.5$时偏好不同的BAO距离比，驱动了不同的CPL膨胀历史。通过比较角BAO尺度，包括共同的$z=0.510$点和保守的BAOtr局部插值（无外推），量化了这种不匹配。在CPL中，预重组物理固定，$r_{ m d}$几乎不变，因此$H_0$的变化被晚期膨胀自由度吸收而非声学 horizon的变化。贝叶斯证据同样依赖于低红移数据：当PP\&SH0ES和/或BAOtr包含时，它倾向于CPL，对于CMB单独或CMB+DESI是不确定的，而对于CMB+SDSS则略微倾向于$Λ$CDM。这些结果表明，CPL的明显支持及其缓解哈勃矛盾的能力并非普遍，这促使了更灵活的晚期模型和对BAO系统误差的更仔细审查。
