2026/07/29 by Fernanda Oliveira, Miguel A. Sabogal, Felipe Avila +2
Economics, Econometrics and Finance · Physics and Astronomy · #Complex Systems and Time Series Analysis #Opinion Dynamics and Social Influence #Theoretical and Computational Physics #astro-ph.CO
paper · pdf · doi:10.1016/j.dark.2026.102410
10 pages, 2 figures
openalex publication_date 2026/07/29 · openalex created_date 2026/07/30 · arxiv created 2026/08/03 · arxiv updated 2026/08/04 · openalex updated_date 2026/08/04
We investigate recent reports of a suppression in the growth rate of cosmic structures inferred from analyses of the [fσ8](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 [fσ8](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 [fσ8](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 S8 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.