Quintessence dark energy model in non-linear f(Q) theory with bulk-viscosity

2025/06/03 by Maurya, Dinesh Chandra
#83C15 #83C56 #83D05 #83F05 #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.2506.02543

Abstract

In this study, we investigate a locally rotationally symmetric (LRS) Bianchi type-I cosmological model in non-linear form of f(Q) gravity with observational constraints. We solved the modified Einstein's field equations with a viscous fluid source and got a hyperbolic solution. First, we apply MCMC analysis to the cosmic chronometer (CC), Baryon Acoustic Oscillation (BAO) and Pantheon datasets to place observational constraints on the model parameters. Using constrained values of model parameters, we study the behavior of cosmological parameters, such as the Hubble parameter H, the deceleration parameter q, and the equation of state (EoS) parameter ω_v with the skewness parameter δ_v for the viscous fluid. In addition, we perform the Om diagnostics and statefinder analysis to categorize dark energy models. Also, we studied cosmographic series coefficients to explore the whole evolution of the derived universe model. We estimated the current age of the universe as t₀≈13.8 Gyrs. We obtained a quintessential and ever-accelerating model with bulk viscosity fluid.

Citations

• Model-Independent Reconstruction of f(T) Gravity Using Genetic Algorithms
• Origin of bulk viscosity in cosmology and its thermodynamic implications
• Review on f(Q) Gravity
• Cosmology of f(Q) gravity in non-flat Universe
• The Geometrical Trinity of Gravity
• A systematic approach to generalisations of General Relativity and their cosmological implications
• Cosmological degeneracy versus cosmography: a cosmographic dark energy model
• NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Dynamics of dark energy
• Cosmography: Cosmology without the Einstein equations
• Anisotropy in Bianchi-type brane cosmologies
• Statefinder—A new geometrical diagnostic of dark energy
• Symmetric teleparallel general relativity
• The Confrontation between General Relativity and Experiment
• Nonstationary irreversible thermodynamics: A causal relativistic theory
• Thermodynamics of nonstationary and transient effects in a relativistic gas
• The Thermodynamics of Irreversible Processes. III. Relativistic Theory of the Simple Fluid

Related

• Cosmological Evolution of Viscous Dark Energy in f(Q,C) Gravity: Two-Fluid Approach
• Constraining viscous fluid models in f(Q) gravity with data
• A flat FLRW dark energy model in f(Q,C)-gravity theory with observational constraints
• Constraints on bulk viscosity in f(Q,T) gravity from H(z)/Pantheon+ data
• New Agegraphic Dark Energy Driven Reconstruction of \boldmathf(Q) Gravity and its Cosmological Implications