Dark energy nature of logarithmic f(R,Lm)-gravity models with observational constraints
May 18, 202417 pages
Published in:
- Int.J.Mod.Phys.A 39 (2024) 07n08, 2450043
- Published: May 18, 2024
Citations per year
Abstract: (WSP)
This work explores the dark energy nature of logarithmic f(R,Lm)-gravity models with observational constraints, where Lm represents the matter Lagrangian for perfect fluid and R is the Ricci-scalar curvature. With a matter Lagrangian Lm=ρ, a flat FLRW space–time metric and an arbitrary function f(R,Lm)=R2+Lm−μlnLm, where μ is a positive model parameter, we have derived the field equations of this model. By using the Hubble function, we have been able to solve the energy conservation equation and create a relationship between Ωm0, Ωq0 and Ωμ0. Using the most recent two observational datasets as 32 H(z) and 1048 Pantheon SNe Ia datasets, we conducted MCMC analysis. We have obtained best fit values of model parameters with 1−σ,2−σ,3−σ errors and using these values, we have explored the cosmological properties of the model. We have performed om diagnostic analysis for the model and estimated the present age of the universe. Thus our derived model presents a transit phase decelerating to accelerating model without dark energy term Λ. We found that the effective equation of state parameter is in the range −1≤ω≤0 over −1≤z<∞ with present value ω≈−0.6971,−0.7120.- Observational constraints
- dark energy
- f(R,Lm)-gravity
- flat FLRW universe
- transit universe
References(0)
Figures(0)
Loading ...