arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.03110astro-ph.COgr-qchep-phhep-th
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引力光偏偏离广义相对论的证据:基于KiDS-Legacy和CMB透镜数据的宇宙学尺度

Evidence for deviation in gravitational light deflection from general relativity at cosmological scales with KiDS-Legacy and CMB lensing

College of Sciences, Northeastern University(东北大学理学院);School of Physics and Optoelectronic Engineering, Yangtze University(长江大学物理与电子信息学院)

Guo-Hong Du, Tian-Nuo Li, Tonghua Liu, Jing-Fei Zhang, Xin Zhang

AI总结:

利用KiDS-Legacy和CMB透镜数据测试广义相对论,发现引力光偏偏离广义相对论,提示新物理或数据系统误差。

摘要:

广义相对论(GR)面临宇宙加速和观测紧张,需要在宇宙学尺度进行严格测试。本文通过μ-Σ修正引力参数化,结合KiDS-Legacy弱透镜数据(1347平方度,z≤2.0)、联合宇宙微波背景(CMB)数据(Planck、ACT和SPT)、DESI DR2 baryon acoustic oscillation和DES-Dovekie超新星数据,发现KiDS-Legacy显著提高约束精度:μ0(物质聚类)提高约60%,Σ0(引力光偏)提高约43%。在ΛCDM背景下,μ0=0.21±0.21与GR一致,而Σ0=0.149±0.051在3.0σ水平偏离GR。进一步在观测偏好w0waCDM背景下,引力光偏偏离在2.2σ水平持续。该偏离可能由大尺度CMB透镜测量的高振幅驱动。GR一致的物质聚类与偏离的光偏分离提供了新物理或数据系统误差的关键观测线索。本工作强调高精度CMB和弱透镜数据协同在推进GR测试中的关键作用。

英文摘要:

General relativity (GR) faces challenges from cosmic acceleration and observational tensions, necessitating stringent tests at cosmological scales. In this work, we probe GR deviations via a $μ$--$Σ$ modified gravity parameterization, integrating KiDS-Legacy weak lensing (WL) data (1347 deg$^2$, $z\leq 2.0$), joint cosmic microwave background (CMB) data from Planck, ACT, and SPT, DESI DR2 baryon acoustic oscillation, and DES-Dovekie supernova data. KiDS-Legacy significantly improves constraint precision: $μ_0$ (matter clustering) by $\sim 60\%$ and $Σ_0$ (gravitational light deflection) by $\sim 43\%$ relative to CMB alone. In the $Λ$CDM background, $μ_0 = 0.21\pm 0.21$ is consistent with GR, while $Σ_0 = 0.149\pm 0.051$ deviates from GR at the 3.0$σ$ level. Furthermore, within the observationally preferred $w_0w_a$CDM background, this deviation in gravitational light deflection persists at the 2.2$σ$ level. This deviation is likely driven by the higher amplitudes in the large-scale CMB lensing measurements. This precise separation of GR-consistent matter clustering and deviant light deflection provides key observational clues for new physics or data systematics. Our work underscores the critical role of synergizing high-precision CMB and WL data in advancing GR tests.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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