发表机构
California Institute of Technology; Université Paris-Saclay, CNRS/IN2P3, IJCLab; Waterloo Centre for Astrophysics, University of Waterloo; Department of Physics and Astronomy, University of Waterloo; Perimeter Institute for Theoretical Physics; Department of Physics & Astronomy, University of British Columbia（加州理工学院; 巴黎萨克雷大学，法国国家科学研究中心/法国国家粒子物理研究所，IJCLab; 滑铁卢天体物理学中心，滑铁卢大学; 滑铁卢大学物理与天文系; 基础理论物理研究所; 不列颠哥伦比亚大学物理与天文系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出单参数“引力宇宙瑕疵”模型，以Hořava引力为框架，拟合CMB与DESI数据，发现比双参数动力学暗能量更优，且能预测DESI距离，暗示引力常数偏差而非暗能量。
AI 中文摘要
重子声学振荡与宇宙微波背景数据的联合分析已开始温和地偏向于偏离ΛCDM模型。这通常被表述为双参数动力学暗能量。然而，一个单参数的“引力宇宙瑕疵”模型——其宇宙学引力耦合不同于牛顿常数，正如Hořava引力所预言的那样——至少拟合得同样好。Planck+ACT+SPT与DESI DR2给出G_cosmo/G_N=0.9920±0.0025，即对较弱宇宙学引力有3.3σ的偏好，且该结果对加入CMB透镜和超新星数据具有稳健性。仅拟合CMB时，该瑕疵模型能预测DESI距离；而w0waCDM则不能。
英文摘要
Combined baryon acoustic oscillation and cosmic microwave background data have begun to mildly favor departures from $Λ\mathrm{CDM}$. This is usually framed as 2-parameter dynamical dark energy. However, a 1-parameter "cosmic glitch in gravity" model, whose cosmological gravitational coupling differs from Newton's constant as in Hořava gravity, fits at least as well. $\textit{Planck}$+ACT+SPT and DESI~DR2 give $G_\mathrm{cosmo}/G_\mathrm{N}=0.9920\pm0.0025$, a $3.3\,σ$ preference for weaker cosmological gravity, robust to adding CMB lensing and supernovae. Fitted to the CMB alone, the glitch predicts DESI distances; $w_0w_a$CDM does not.
Comments6+8 pages, 9 figures, 4 tables
