AI 中文总结
该研究检验了宇宙结构增长速率受抑制的报道，通过多数据联合分析发现尺度依赖增长存在2.2σ的统计证据，$k$依赖增长模型可解释物质成团且不加剧宇宙学张力。
AI 中文摘要
我们调查了通过分析 $[f\boldsymbol{\sigma}_8](z)$ 数据集推断出的宇宙结构增长速率受到抑制的最新报道。为解决该问题，我们探究了物质成团演化在尺度依赖修正引力框架下能更准确描述这一假设。我们使用马尔可夫链蒙特卡洛技术对 $[f\boldsymbol{\sigma}_8](z)$、宇宙计时器 $H(z)$ 测量值、光度距离数据及 CMB 观测结果进行联合分析，以约束尺度依赖宇宙学模型的参数，并探究其对 $[f\boldsymbol{\sigma}_8](z)$ 演化的影响。我们的结果表明，大尺度结构增长速率的抑制在物质主导时期比暗能量主导时期更为显著。我们发现尺度依赖增长存在 $2.2\\, \sigma$ 的统计显著性证据。此外，我们约束了 $S_8$ 参数，发现其与普朗克合作组 CMB 观测推断出的值一致。总体而言，我们的分析显示，$k$ 依赖增长模型为观测到的物质成团提供了可行的解释，且不会加剧当前的宇宙学张力。
英文摘要
We investigate recent reports of a suppression in the growth rate of cosmic structures inferred from analyses of the $[fσ_8](z)$ dataset. To address this issue, we explore the hypothesis that the evolution of matter clustering is more accurately described within the framework of scale-dependent modified gravity. We perform a joint analysis of $[fσ_8](z)$, cosmic chronometer $H(z)$ measurements, luminosity distance data, and CMB observations using Markov Chain Monte Carlo techniques to constrain the parameters of a scale-dependent cosmological model and investigate its impact on the evolution of $[fσ_8](z)$. Our results indicate that the suppression of the growth rate of large-scale structures is more pronounced during the matter-dominated era than in the dark-energy-dominated epoch. We find evidence for scale-dependent growth at a statistical significance of $2.2\, σ$. In addition, we constrain the $S_8$ parameter and find it to be consistent with the value inferred from the CMB observations of the Planck Collaboration. Overall, our analysis shows that $k$-dependent growth models provide a viable explanation for the observed clustering of matter without exacerbating the current cosmological tensions.
Comments10 pages, 2 figures
DOI：10.1016/j.dark.2026.102410
