2024/10/29 by Shaily, J. K. Singh, Mohit Tyagi +4 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.2411.00032
openalex publication_date 2024/10/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this work, we developed a cosmological model in f(Q, C) gravity within the framework of symmetric teleparallel geometry. In addition to the non-metricity scalar Q , our formulation includes the boundary term C , which accounts for its deviation from the standard Levi-Civita Ricci scalar R^* in the Lagrangian. We derived the field equations for the metric and affine connection, employed them within a cosmological setting, and a vanishing affine connection to derive modified Friedmann equations. We used the latest observational dataset OHD in the redshift range z ∈ [0, 2.36], Pantheon + SH0ES in the redshift range z ∈ (0.01, 2.26), BAO, and the joint datasets OHD + Pantheon + SH0ES and OHD + Pantheon + SH0ES + BAO to constrain the parameters of our model by employing Markov Chain Monte Carlo (MCMC) method to minimize the χ2 term. Using the constrained free model parameters, we carefully analyzed the behavior of different physical parameters and verified that the model transits from deceleration to acceleration. Finally, we observed that the model demonstrates an expanding quintessence dark energy model and converges to the ΛCDM in later times.