The cosmology of f(R, L_m) gravity: constraining the background and perturbed dynamics

2024/06/12 by Sahlu, Shambel, Alfedeel, Alnadhief H. A., Abebe, Amare · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.2406.08303

Abstract

This paper delves into the late-time accelerated expansion of the universe and the evolution of cosmic structures within the context of a specific \( f(R, L_m) \) gravity model, formulated as \( f(R, L_m) = λR + βL_m^α+ η\). To study the cosmological viability of the model, we employed the latest cosmic measurement datasets: i) 57 observational Hubble parameter data points (OHD); ii) 1048 distance moduli data points (SNIa); iii) a combined dataset (OHD+SNIa); and large scale structure datasets, including iv) 14 growth rate data points (f); and v) 30 redshift space distortion data points (fσ₈). These datasets facilitated the constraint of the \( f(R, L_m) \)-gravity model via MCMC simulations, followed by a comparative analysis with the \(Λ\)CDM model. A comprehensive statistical analysis has been conducted to evaluate the \( f(R, L_m) \)-gravity model's efficacy in explaining both the accelerated expansion of the universe and the growth of cosmic structures.

Cited by

• Is ω₀ ω_aCDM a good model for the clumpy Universe?
• Exploring the signature of assembly bias and modified gravity using small-scale clusterings of galaxies

Related

• Growth Rate Analysis in f(R,L_m) Gravity: A Comparative Study with \boldmathΛCDM Cosmology
• The consequence of higher-order curvature-based constraints on f(R, L_m) gravity
• Constraining a f(R, L_m) Gravity Cosmological Model with Observational Data
• Accelerated expansion of the universe model with parametrization of q(z) in f(R,L_m) theory of gravity
• Study of Curvature-Matter Coupling in Modified Gravity