2025/09/12 by Dinesh Chandra Maurya, Rashid Zia, Maurya, Dinesh Chandra +1
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #COSMIC cancer database #Causality (physics) #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark energy #Equation of state #Function (biology) #Galaxies: Formation, Evolution, Phenomena #Geophysics and Gravity Measurements #Hubble's law #Lambda-CDM model #Metric expansion of space #Statistical Mechanics and Entropy #Universe
paper · pdf · doi:10.1142/s0219887826502956
published in International Journal of Geometric Methods in Modern Physics (World Scientific)
openalex publication_date 2026/06/27 · openalex created_date 2026/06/28 · openalex updated_date 2026/07/21
We have investigated the cosmological consequences of the model in the recently developed gravity theory [Haghani and Harko, Eur. Phys. J. C 81 (2021) 615] using a nonlinear form of the [Formula: see text] function and the latest observational datasets. For flat Friedman–Lemaître–Robertson–Walker (FLRW) spacetime and [Formula: see text] with [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] as coupling constants, we have solved the modified field equations to get the Hubble function [Formula: see text] in terms of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. To ensure that the model is consistent with the physically observed universe, we constrained the model parameters using Monte Carlo Markov Chain (MCMC) analysis on joint datasets of cosmic chronometer and Pantheon samples. Using these approximated model parameter values, we investigated the universe’s cosmic evolution history, including the deceleration parameter, effective equation of state, dark energy equation of state, total dark energy density parameters and universe age. In addition, to assess the physical acceptability and stability of the generated model, we conducted the Om diagnostic test, causality test and energy conditions test.