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September 17, 2025The European Physical Journal C0 citationsOpen Access

Cosmic structure growth and perturbation analysis in logarithmic f(Q) gravity

LSL. SudharaniKuvempu University NKN. S. KavyaNational Institute of Technology Warangal VVV. VenkateshaKuvempu University

Key Points

The study reveals that the logarithmic f(Q) gravity model supports an accelerated cosmic expansion, resembling quintessence dynamics.
Using data from RSD and DESI, parameters were constrained, demonstrating consistency with astrophysical observations.
Perturbation analysis indicates significant insights into the growth rate of structure through fσ8 metrics, addressing the S8 tension.
Markov Chain Monte Carlo techniques were employed to finely tune model parameters based on observational datasets.

Abstract

Abstract In this work, we explore a cosmological model within the framework of modified gravity, specifically a logarithmic form of f (Q) gravity. Using recent observational datasets including RSD and DESI, we constrain the model parameters via Markov Chain Monte Carlo (MCMC) techniques. Our analysis focuses on both background and perturbation-level cosmological diagnostics, evaluating the evolution of cosmographic parameters and the growth rate of structure through f ₈ f σ 8. The results demonstrate consistency with observational data, particularly supporting a quintessence-like accelerated expansion. Additionally, the model addresses the S₈ S 8 tension and provides insights into the late-time behavior of dark energy.

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